520149640 has 16 divisors (see below), whose sum is σ = 1170336780. Its totient is φ = 208059840.

The previous prime is 520149593. The next prime is 520149647. The reversal of 520149640 is 46941025.

It can be written as a sum of positive squares in 2 ways, for example, as 441756324 + 78393316 = 21018^2 + 8854^2 .

It is not an unprimeable number, because it can be changed into a prime (520149647) 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, 6501831 + ... + 6501910.

Almost surely, 2^520149640 is an apocalyptic number.

It is an amenable number.

520149640 is an abundant number, since it is smaller than the sum of its proper divisors (650187140).

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

520149640 is a wasteful number, since it uses less digits than its factorization.

520149640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13003752 (or 13003748 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 520149640 is about 22806.7893400189. The cubic root of 520149640 is about 804.2222803971. Note that the first 4 decimals are identical.

The spelling of 520149640 in words is "five hundred twenty million, one hundred forty-nine thousand, six hundred forty".