51706620 has 96 divisors (see below), whose sum is σ = 183859200. Its totient is φ = 11817792.

The previous prime is 51706609. The next prime is 51706643. The reversal of 51706620 is 2660715.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3060 + ... + 10619.

It is an arithmetic number, because the mean of its divisors is an integer number (1915200).

Almost surely, 2^51706620 is an apocalyptic number.

It is an amenable number.

51706620 is an abundant number, since it is smaller than the sum of its proper divisors (132152580).

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

51706620 is a wasteful number, since it uses less digits than its factorization.

51706620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13704 (or 13696 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 51706620 is about 7190.7315344129. The cubic root of 51706620 is about 372.5478400488.

It can be divided in two parts, 51706 and 620, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 51706620 in words is "fifty-one million, seven hundred six thousand, six hundred twenty".