51578616 has 32 divisors (see below), whose sum is σ = 135734400. Its totient is φ = 16287840.

The previous prime is 51578609. The next prime is 51578621. The reversal of 51578616 is 61687515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56100 + ... + 57011.

It is an arithmetic number, because the mean of its divisors is an integer number (4241700).

Almost surely, 2^51578616 is an apocalyptic number.

It is an amenable number.

51578616 is an abundant number, since it is smaller than the sum of its proper divisors (84155784).

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

51578616 is a wasteful number, since it uses less digits than its factorization.

51578616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113139 (or 113135 counting only the distinct ones).

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

The square root of 51578616 is about 7181.8253947029. The cubic root of 51578616 is about 372.2401617188.

The spelling of 51578616 in words is "fifty-one million, five hundred seventy-eight thousand, six hundred sixteen".