52639990 has 32 divisors (see below), whose sum is σ = 108047520. Its totient is φ = 18292224.

The previous prime is 52639987. The next prime is 52639997. The reversal of 52639990 is 9993625.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52639997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9700 + ... + 14119.

It is an arithmetic number, because the mean of its divisors is an integer number (3376485).

Almost surely, 2^52639990 is an apocalyptic number.

52639990 is an abundant number, since it is smaller than the sum of its proper divisors (55407530).

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

52639990 is a wasteful number, since it uses less digits than its factorization.

52639990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23856.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 52639990 is about 7255.3421697395. The cubic root of 52639990 is about 374.7761389825.

The spelling of 52639990 in words is "fifty-two million, six hundred thirty-nine thousand, nine hundred ninety".