51180920 has 32 divisors (see below), whose sum is σ = 131608800. Its totient is φ = 17547648.

The previous prime is 51180869. The next prime is 51180973. The reversal of 51180920 is 2908115.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51180920.

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, 91115 + ... + 91674.

It is an arithmetic number, because the mean of its divisors is an integer number (4112775).

Almost surely, 2^51180920 is an apocalyptic number.

It is an amenable number.

51180920 is an abundant number, since it is smaller than the sum of its proper divisors (80427880).

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

51180920 is a wasteful number, since it uses less digits than its factorization.

51180920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182807 (or 182803 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 51180920 is about 7154.0841482331. The cubic root of 51180920 is about 371.2809751691.

The spelling of 51180920 in words is "fifty-one million, one hundred eighty thousand, nine hundred twenty".