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520688 = 2474649
BaseRepresentation
bin1111111000111110000
3222110020202
41333013300
5113130223
615054332
74266020
oct1770760
9873222
10520688
11326223
122113a8
13152ccc
14d7a80
15a4428
hex7f1f0

520688 has 20 divisors (see below), whose sum is σ = 1153200. Its totient is φ = 223104.

The previous prime is 520679. The next prime is 520691. The reversal of 520688 is 886025.

It is a happy number.

It is a super-2 number, since 2×5206882 = 542231986688, which contains 22 as substring.

It is a nialpdrome in base 9.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 520688.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 520688.

It is an unprimeable number.

520688 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213 + ... + 2436.

It is an arithmetic number, because the mean of its divisors is an integer number (57660).

2520688 is an apocalyptic number.

It is an amenable number.

520688 is an abundant number, since it is smaller than the sum of its proper divisors (632512).

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

520688 is a wasteful number, since it uses less digits than its factorization.

520688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664 (or 4658 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 520688 is about 721.5871395750. The cubic root of 520688 is about 80.4499644055.

The spelling of 520688 in words is "five hundred twenty thousand, six hundred eighty-eight".

Divisors: 1 2 4 7 8 14 16 28 56 112 4649 9298 18596 32543 37192 65086 74384 130172 260344 520688