51900044 has 36 divisors (see below), whose sum is σ = 105413616. Its totient is φ = 21901824.

The previous prime is 51900019. The next prime is 51900047. The reversal of 51900044 is 44000915.

It is a happy number.

It is a super-2 number, since 2×51900044² = 5387229134403872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51899992 and 51900019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51900047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 263354 + ... + 263550.

It is an arithmetic number, because the mean of its divisors is an integer number (2928156).

Almost surely, 2^51900044 is an apocalyptic number.

It is an amenable number.

51900044 is an abundant number, since it is smaller than the sum of its proper divisors (53513572).

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

51900044 is a wasteful number, since it uses less digits than its factorization.

51900044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51900044 is about 7204.1685155193. The cubic root of 51900044 is about 373.0118040190.

Adding to 51900044 its reverse (44000915), we get a palindrome (95900959).

The spelling of 51900044 in words is "fifty-one million, nine hundred thousand, forty-four".