51690140 has 24 divisors (see below), whose sum is σ = 108706752. Its totient is φ = 20646080.

The previous prime is 51690097. The next prime is 51690173. The reversal of 51690140 is 4109615.

51690140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16802 + ... + 19638.

It is an arithmetic number, because the mean of its divisors is an integer number (4529448).

Almost surely, 2^51690140 is an apocalyptic number.

It is an amenable number.

51690140 is an abundant number, since it is smaller than the sum of its proper divisors (57016612).

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

51690140 is a wasteful number, since it uses less digits than its factorization.

51690140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757 (or 3755 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51690140 is about 7189.5855235194. The cubic root of 51690140 is about 372.5082562019.

Adding to 51690140 its reverse (4109615), we get a palindrome (55799755).

The spelling of 51690140 in words is "fifty-one million, six hundred ninety thousand, one hundred forty".