51172992 has 256 divisors, whose sum is σ = 174787200. Its totient is φ = 14598144.

The previous prime is 51172987. The next prime is 51172997. The reversal of 51172992 is 29927115.

It is an interprime number because it is at equal distance from previous prime (51172987) and next prime (51172997).

It is a super-2 number, since 2×51172992² = 5237350220464128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51172997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 763743 + ... + 763809.

Almost surely, 2^51172992 is an apocalyptic number.

51172992 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51172992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87393600).

51172992 is an abundant number, since it is smaller than the sum of its proper divisors (123614208).

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

51172992 is a wasteful number, since it uses less digits than its factorization.

51172992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 102 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 51172992 is about 7153.5300376807. The cubic root of 51172992 is about 371.2618035223.

The spelling of 51172992 in words is "fifty-one million, one hundred seventy-two thousand, nine hundred ninety-two".