51890644 has 12 divisors (see below), whose sum is σ = 97794004. Its totient is φ = 23949504.

The previous prime is 51890633. The next prime is 51890651. The reversal of 51890644 is 44609815.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17808400 + 34082244 = 4220^2 + 5838^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498897 + ... + 499000.

Almost surely, 2^51890644 is an apocalyptic number.

It is an amenable number.

51890644 is a deficient number, since it is larger than the sum of its proper divisors (45903360).

51890644 is a wasteful number, since it uses less digits than its factorization.

51890644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997914 (or 997912 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 51890644 is about 7203.5160859125. The cubic root of 51890644 is about 372.9892830191.

The spelling of 51890644 in words is "fifty-one million, eight hundred ninety thousand, six hundred forty-four".