51890645 has 16 divisors (see below), whose sum is σ = 65169792. Its totient is φ = 39589440.

The previous prime is 51890633. The next prime is 51890651. The reversal of 51890645 is 54609815.

It is not a de Polignac number, because 51890645 - 2⁶ = 51890581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51890599 and 51890608.

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, 74750 + ... + 75440.

It is an arithmetic number, because the mean of its divisors is an integer number (4073112).

Almost surely, 2^51890645 is an apocalyptic number.

It is an amenable number.

51890645 is a deficient number, since it is larger than the sum of its proper divisors (13279147).

51890645 is a wasteful number, since it uses less digits than its factorization.

51890645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 51890645 is about 7203.5161553230. The cubic root of 51890645 is about 372.9892854151.

The spelling of 51890645 in words is "fifty-one million, eight hundred ninety thousand, six hundred forty-five".