52561640 has 32 divisors (see below), whose sum is σ = 118747080. Its totient is φ = 20938752.

The previous prime is 52561627. The next prime is 52561643. The reversal of 52561640 is 4616525.

It can be written as a sum of positive squares in 4 ways, for example, as 41499364 + 11062276 = 6442^2 + 3326^2 .

It is not an unprimeable number, because it can be changed into a prime (52561643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7724 + ... + 12836.

Almost surely, 2^52561640 is an apocalyptic number.

It is an amenable number.

52561640 is an abundant number, since it is smaller than the sum of its proper divisors (66185440).

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

52561640 is a wasteful number, since it uses less digits than its factorization.

52561640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381 (or 5377 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 52561640 is about 7249.9406894126. The cubic root of 52561640 is about 374.5901062028.

The spelling of 52561640 in words is "fifty-two million, five hundred sixty-one thousand, six hundred forty".