51972990 has 32 divisors (see below), whose sum is σ = 125054496. Its totient is φ = 13824000.

The previous prime is 51972989. The next prime is 51973013. The reversal of 51972990 is 9927915.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10990 + ... + 14990.

It is an arithmetic number, because the mean of its divisors is an integer number (3907953).

Almost surely, 2^51972990 is an apocalyptic number.

51972990 is an abundant number, since it is smaller than the sum of its proper divisors (73081506).

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

51972990 is a wasteful number, since it uses less digits than its factorization.

51972990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 51972990 is about 7209.2295011326. The cubic root of 51972990 is about 373.1864794083.

The spelling of 51972990 in words is "fifty-one million, nine hundred seventy-two thousand, nine hundred ninety".