51515790 has 32 divisors (see below), whose sum is σ = 124001280. Its totient is φ = 13697184.

The previous prime is 51515773. The next prime is 51515801. The reversal of 51515790 is 9751515.

It is a super-4 number, since 4×51515790⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

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, 8671 + ... + 13349.

It is an arithmetic number, because the mean of its divisors is an integer number (3875040).

Almost surely, 2^51515790 is an apocalyptic number.

51515790 is an abundant number, since it is smaller than the sum of its proper divisors (72485490).

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

51515790 is a wasteful number, since it uses less digits than its factorization.

51515790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056.

The product of its (nonzero) digits is 7875, while the sum is 33.

The square root of 51515790 is about 7177.4501043198. The cubic root of 51515790 is about 372.0889629986.

The spelling of 51515790 in words is "fifty-one million, five hundred fifteen thousand, seven hundred ninety".