51891790 has 16 divisors (see below), whose sum is σ = 94280112. Its totient is φ = 20562304.

The previous prime is 51891787. The next prime is 51891809. The reversal of 51891790 is 9719815.

It is a happy number.

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, 23179 + ... + 25318.

It is an arithmetic number, because the mean of its divisors is an integer number (5892507).

Almost surely, 2^51891790 is an apocalyptic number.

51891790 is a deficient number, since it is larger than the sum of its proper divisors (42388322).

51891790 is a wasteful number, since it uses less digits than its factorization.

51891790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48611.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 51891790 is about 7203.5956299615. The cubic root of 51891790 is about 372.9920288100.

The spelling of 51891790 in words is "fifty-one million, eight hundred ninety-one thousand, seven hundred ninety".