51643964 has 12 divisors (see below), whose sum is σ = 91309344. Its totient is φ = 25555584.

The previous prime is 51643937. The next prime is 51643981. The reversal of 51643964 is 46934615.

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, 66164 + ... + 66939.

It is an arithmetic number, because the mean of its divisors is an integer number (7609112).

Almost surely, 2^51643964 is an apocalyptic number.

It is an amenable number.

51643964 is a deficient number, since it is larger than the sum of its proper divisors (39665380).

51643964 is a wasteful number, since it uses less digits than its factorization.

51643964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133204 (or 133202 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 51643964 is about 7186.3734943294. The cubic root of 51643964 is about 372.3972997359.

The spelling of 51643964 in words is "fifty-one million, six hundred forty-three thousand, nine hundred sixty-four".