51306636 has 24 divisors (see below), whose sum is σ = 121746240. Its totient is φ = 16812112.

The previous prime is 51306623. The next prime is 51306649. The reversal of 51306636 is 63660315.

It is an interprime number because it is at equal distance from previous prime (51306623) and next prime (51306649).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35526 + ... + 36941.

It is an arithmetic number, because the mean of its divisors is an integer number (5072760).

Almost surely, 2^51306636 is an apocalyptic number.

It is an amenable number.

51306636 is an abundant number, since it is smaller than the sum of its proper divisors (70439604).

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

51306636 is a wasteful number, since it uses less digits than its factorization.

51306636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72533 (or 72531 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 51306636 is about 7162.8650692303. The cubic root of 51306636 is about 371.5847198350.

The spelling of 51306636 in words is "fifty-one million, three hundred six thousand, six hundred thirty-six".