51645704 has 24 divisors (see below), whose sum is σ = 106441230. Its totient is φ = 23474880.

The previous prime is 51645703. The next prime is 51645707. The reversal of 51645704 is 40754615.

It can be written as a sum of positive squares in only one way, i.e., 33988900 + 17656804 = 5830^2 + 4202^2 .

It is not an unprimeable number, because it can be changed into a prime (51645701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25709 + ... + 27644.

Almost surely, 2^51645704 is an apocalyptic number.

It is an amenable number.

51645704 is an abundant number, since it is smaller than the sum of its proper divisors (54795526).

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

51645704 is a wasteful number, since it uses less digits than its factorization.

51645704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53381 (or 53366 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 51645704 is about 7186.4945557622. The cubic root of 51645704 is about 372.4014819866.

The spelling of 51645704 in words is "fifty-one million, six hundred forty-five thousand, seven hundred four".