51891072 has 64 divisors (see below), whose sum is σ = 145962000. Its totient is φ = 16277504.

The previous prime is 51891061. The next prime is 51891083. The reversal of 51891072 is 27019815.

It is an interprime number because it is at equal distance from previous prime (51891061) and next prime (51891083).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 2554 + ... + 10502.

Almost surely, 2^51891072 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 51891072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72981000).

51891072 is an abundant number, since it is smaller than the sum of its proper divisors (94070928).

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

51891072 is a wasteful number, since it uses less digits than its factorization.

51891072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7983 (or 7971 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 51891072 is about 7203.5457935658. The cubic root of 51891072 is about 372.9903085024.

The spelling of 51891072 in words is "fifty-one million, eight hundred ninety-one thousand, seventy-two".