51695644 has 48 divisors (see below), whose sum is σ = 121476096. Its totient is φ = 18590400.

The previous prime is 51695639. The next prime is 51695653. The reversal of 51695644 is 44659615.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51695597 and 51695606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2452 + ... + 10459.

It is an arithmetic number, because the mean of its divisors is an integer number (2530752).

Almost surely, 2^51695644 is an apocalyptic number.

It is an amenable number.

51695644 is an abundant number, since it is smaller than the sum of its proper divisors (69780452).

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

51695644 is a wasteful number, since it uses less digits than its factorization.

51695644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12946 (or 12944 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 51695644 is about 7189.9682892208. The cubic root of 51695644 is about 372.5214773737.

The spelling of 51695644 in words is "fifty-one million, six hundred ninety-five thousand, six hundred forty-four".