51990912 has 48 divisors (see below), whose sum is σ = 149612580. Its totient is φ = 17329920.

The previous prime is 51990893. The next prime is 51990931. The reversal of 51990912 is 21909915.

It is an interprime number because it is at equal distance from previous prime (51990893) and next prime (51990931).

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21414 + ... + 23717.

Almost surely, 2^51990912 is an apocalyptic number.

It is an amenable number.

51990912 is an abundant number, since it is smaller than the sum of its proper divisors (97621668).

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

51990912 is a wasteful number, since it uses less digits than its factorization.

51990912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45151 (or 45136 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 51990912 is about 7210.4723839704. The cubic root of 51990912 is about 373.2293701447.

The spelling of 51990912 in words is "fifty-one million, nine hundred ninety thousand, nine hundred twelve".