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622890 = 2345769
BaseRepresentation
bin10011000000100101010
31011122110000
42120010222
5124413030
621203430
75203002
oct2300452
91148400
10622890
11395a94
12260576
1318a698
14123002
15c4860
hex9812a

622890 has 40 divisors (see below), whose sum is σ = 1677060. Its totient is φ = 165888.

The previous prime is 622889. The next prime is 622901. The reversal of 622890 is 98226.

It can be written as a sum of positive squares in 2 ways, for example, as 613089 + 9801 = 783^2 + 99^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 426 + ... + 1194.

2622890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 622890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (838530).

622890 is an abundant number, since it is smaller than the sum of its proper divisors (1054170).

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

622890 is a wasteful number, since it uses less digits than its factorization.

622890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 622890 is about 789.2338056622. The cubic root of 622890 is about 85.4024742102.

The spelling of 622890 in words is "six hundred twenty-two thousand, eight hundred ninety".

Divisors: 1 2 3 5 6 9 10 15 18 27 30 45 54 81 90 135 162 270 405 769 810 1538 2307 3845 4614 6921 7690 11535 13842 20763 23070 34605 41526 62289 69210 103815 124578 207630 311445 622890