51645402 has 24 divisors (see below), whose sum is σ = 112038420. Its totient is φ = 17193600.

The previous prime is 51645397. The next prime is 51645413. The reversal of 51645402 is 20454615.

It can be written as a sum of positive squares in 2 ways, for example, as 39050001 + 12595401 = 6249^2 + 3549^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20424 + ... + 22812.

Almost surely, 2^51645402 is an apocalyptic number.

51645402 is an abundant number, since it is smaller than the sum of its proper divisors (60393018).

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

51645402 is a wasteful number, since it uses less digits than its factorization.

51645402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598 (or 3595 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 51645402 is about 7186.4735440966. The cubic root of 51645402 is about 372.4007561085.

The spelling of 51645402 in words is "fifty-one million, six hundred forty-five thousand, four hundred two".