51685388 has 12 divisors (see below), whose sum is σ = 92156400. Its totient is φ = 25354992.

The previous prime is 51685369. The next prime is 51685397. The reversal of 51685388 is 88358615.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

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, 121688 + ... + 122111.

It is an arithmetic number, because the mean of its divisors is an integer number (7679700).

Almost surely, 2^51685388 is an apocalyptic number.

It is an amenable number.

51685388 is a deficient number, since it is larger than the sum of its proper divisors (40471012).

51685388 is a wasteful number, since it uses less digits than its factorization.

51685388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243856 (or 243854 counting only the distinct ones).

The product of its digits is 230400, while the sum is 44.

The square root of 51685388 is about 7189.2550379020. The cubic root of 51685388 is about 372.4968406561.

The spelling of 51685388 in words is "fifty-one million, six hundred eighty-five thousand, three hundred eighty-eight".