51136992 has 72 divisors (see below), whose sum is σ = 146122704. Its totient is φ = 16963584.

The previous prime is 51136991. The next prime is 51137033. The reversal of 51136992 is 29963115.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×51136992² = 5229983901616128, 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 (51136991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101413 + ... + 101915.

It is an arithmetic number, because the mean of its divisors is an integer number (2029482).

Almost surely, 2^51136992 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 51136992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73061352).

51136992 is an abundant number, since it is smaller than the sum of its proper divisors (94985712).

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

51136992 is a wasteful number, since it uses less digits than its factorization.

51136992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 861 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 51136992 is about 7151.0133547631. The cubic root of 51136992 is about 371.1747226892.

The spelling of 51136992 in words is "fifty-one million, one hundred thirty-six thousand, nine hundred ninety-two".