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72800 = 2552713
BaseRepresentation
bin10001110001100000
310200212022
4101301200
54312200
61321012
7422150
oct216140
9120768
1072800
114a772
1236168
13271a0
141c760
1516885
hex11c60

72800 has 72 divisors (see below), whose sum is σ = 218736. Its totient is φ = 23040.

The previous prime is 72797. The next prime is 72817. The reversal of 72800 is 827.

It can be divided in two parts, 72 and 800, that multiplied together give a square (57600 = 2402).

72800 = T27 + T28 + ... + T76.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5594 + ... + 5606.

It is an arithmetic number, because the mean of its divisors is an integer number (3038).

272800 is an apocalyptic number.

72800 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109368).

72800 is an abundant number, since it is smaller than the sum of its proper divisors (145936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72800 is a wasteful number, since it uses less digits than its factorization.

72800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 72800 is about 269.8147512646. The cubic root of 72800 is about 41.7551895733.

The spelling of 72800 in words is "seventy-two thousand, eight hundred".

Divisors: 1 2 4 5 7 8 10 13 14 16 20 25 26 28 32 35 40 50 52 56 65 70 80 91 100 104 112 130 140 160 175 182 200 208 224 260 280 325 350 364 400 416 455 520 560 650 700 728 800 910 1040 1120 1300 1400 1456 1820 2080 2275 2600 2800 2912 3640 4550 5200 5600 7280 9100 10400 14560 18200 36400 72800