51219972 has 96 divisors (see below), whose sum is σ = 141680000. Its totient is φ = 15956352.

The previous prime is 51219901. The next prime is 51219983. The reversal of 51219972 is 27991215.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223554 + ... + 223782.

Almost surely, 2^51219972 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 51219972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70840000).

51219972 is an abundant number, since it is smaller than the sum of its proper divisors (90460028).

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

51219972 is a wasteful number, since it uses less digits than its factorization.

51219972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 362 counting only the distinct ones).

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

The square root of 51219972 is about 7156.8129778554. The cubic root of 51219972 is about 371.3753826063.

The spelling of 51219972 in words is "fifty-one million, two hundred nineteen thousand, nine hundred seventy-two".