51617856 has 28 divisors (see below), whose sum is σ = 136572752. Its totient is φ = 17205888.

The previous prime is 51617833. The next prime is 51617873. The reversal of 51617856 is 65871615.

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, 134230 + ... + 134613.

Almost surely, 2^51617856 is an apocalyptic number.

It is an amenable number.

51617856 is an abundant number, since it is smaller than the sum of its proper divisors (84954896).

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

51617856 is a wasteful number, since it uses less digits than its factorization.

51617856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268858 (or 268848 counting only the distinct ones).

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

The square root of 51617856 is about 7184.5567712977. The cubic root of 51617856 is about 372.3345354631.

The spelling of 51617856 in words is "fifty-one million, six hundred seventeen thousand, eight hundred fifty-six".