51615768 has 16 divisors (see below), whose sum is σ = 129039480. Its totient is φ = 17205248.

The previous prime is 51615763. The next prime is 51615769. The reversal of 51615768 is 86751615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51615763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075305 + ... + 1075352.

Almost surely, 2^51615768 is an apocalyptic number.

It is an amenable number.

51615768 is an abundant number, since it is smaller than the sum of its proper divisors (77423712).

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

51615768 is a wasteful number, since it uses less digits than its factorization.

51615768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150666 (or 2150662 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 51615768 is about 7184.4114581502. The cubic root of 51615768 is about 372.3295149459.

The spelling of 51615768 in words is "fifty-one million, six hundred fifteen thousand, seven hundred sixty-eight".