51997992 has 32 divisors (see below), whose sum is σ = 130248000. Its totient is φ = 17298944.

The previous prime is 51997949. The next prime is 51998029. The reversal of 51997992 is 29979915.

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, 12568 + ... + 16184.

It is an arithmetic number, because the mean of its divisors is an integer number (4070250).

Almost surely, 2^51997992 is an apocalyptic number.

It is an amenable number.

51997992 is an abundant number, since it is smaller than the sum of its proper divisors (78250008).

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

51997992 is a wasteful number, since it uses less digits than its factorization.

51997992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4225 (or 4221 counting only the distinct ones).

The product of its digits is 459270, while the sum is 51.

The square root of 51997992 is about 7210.9633198346. The cubic root of 51997992 is about 373.2463112081.

The spelling of 51997992 in words is "fifty-one million, nine hundred ninety-seven thousand, nine hundred ninety-two".