51987792 has 20 divisors (see below), whose sum is σ = 134301920. Its totient is φ = 17329248.

The previous prime is 51987773. The next prime is 51987811. The reversal of 51987792 is 29778915.

It is an interprime number because it is at equal distance from previous prime (51987773) and next prime (51987811).

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1083079 = 51987792 / (5 + 1 + 9 + 8 + 7 + 7 + 9 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541492 + ... + 541587.

It is an arithmetic number, because the mean of its divisors is an integer number (6715096).

Almost surely, 2^51987792 is an apocalyptic number.

It is an amenable number.

51987792 is an abundant number, since it is smaller than the sum of its proper divisors (82314128).

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

51987792 is a wasteful number, since it uses less digits than its factorization.

51987792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083090 (or 1083084 counting only the distinct ones).

The product of its digits is 317520, while the sum is 48.

The square root of 51987792 is about 7210.2560287413. The cubic root of 51987792 is about 373.2219041032.

The spelling of 51987792 in words is "fifty-one million, nine hundred eighty-seven thousand, seven hundred ninety-two".