51218860 has 96 divisors (see below), whose sum is σ = 136120320. Its totient is φ = 15724800.

The previous prime is 51218831. The next prime is 51218873. The reversal of 51218860 is 6881215.

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, 121450 + ... + 121870.

It is an arithmetic number, because the mean of its divisors is an integer number (1417920).

Almost surely, 2^51218860 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51218860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68060160).

51218860 is an abundant number, since it is smaller than the sum of its proper divisors (84901460).

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

51218860 is a wasteful number, since it uses less digits than its factorization.

51218860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527 (or 525 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 51218860 is about 7156.7352892223. The cubic root of 51218860 is about 371.3726950322.

The spelling of 51218860 in words is "fifty-one million, two hundred eighteen thousand, eight hundred sixty".