51939090 has 64 divisors (see below), whose sum is σ = 158296320. Its totient is φ = 11871360.

The previous prime is 51939079. The next prime is 51939101. The reversal of 51939090 is 9093915.

It is an interprime number because it is at equal distance from previous prime (51939079) and next prime (51939101).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11851 + ... + 15630.

It is an arithmetic number, because the mean of its divisors is an integer number (2473380).

Almost surely, 2^51939090 is an apocalyptic number.

51939090 is an abundant number, since it is smaller than the sum of its proper divisors (106357230).

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

51939090 is a wasteful number, since it uses less digits than its factorization.

51939090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27504 (or 27498 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 51939090 is about 7206.8779648333. The cubic root of 51939090 is about 373.1053233229.

The spelling of 51939090 in words is "fifty-one million, nine hundred thirty-nine thousand, ninety".