51815472 has 80 divisors (see below), whose sum is σ = 138928608. Its totient is φ = 16629760.

The previous prime is 51815461. The next prime is 51815497. The reversal of 51815472 is 27451815.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222268 + ... + 222500.

Almost surely, 2^51815472 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 51815472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69464304).

51815472 is an abundant number, since it is smaller than the sum of its proper divisors (87113136).

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

51815472 is a wasteful number, since it uses less digits than its factorization.

51815472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 392 counting only the distinct ones).

The product of its digits is 11200, while the sum is 33.

The square root of 51815472 is about 7198.2964651367. The cubic root of 51815472 is about 372.8090841849.

The spelling of 51815472 in words is "fifty-one million, eight hundred fifteen thousand, four hundred seventy-two".