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8157040 = 245101963
BaseRepresentation
bin11111000111011101110000
3120100102100121
4133013131300
54042011130
6450500024
7126222313
oct37073560
916312317
108157040
114671561
122894614
1318c7a68
14112497a
15ab1d7a
hex7c7770

8157040 has 20 divisors (see below), whose sum is σ = 18965304. Its totient is φ = 3262784.

The previous prime is 8157031. The next prime is 8157041. The reversal of 8157040 is 407518.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 8156996 and 8157014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8157041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50902 + ... + 51061.

Almost surely, 28157040 is an apocalyptic number.

8157040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8157040 is an abundant number, since it is smaller than the sum of its proper divisors (10808264).

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

8157040 is a wasteful number, since it uses less digits than its factorization.

8157040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101976 (or 101970 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 8157040 is about 2856.0532207926. The cubic root of 8157040 is about 201.3001958044.

It can be divided in two parts, 81 and 57040, that added together give a square (57121 = 2392).

The spelling of 8157040 in words is "eight million, one hundred fifty-seven thousand, forty".

Divisors: 1 2 4 5 8 10 16 20 40 80 101963 203926 407852 509815 815704 1019630 1631408 2039260 4078520 8157040