51881536 has 28 divisors (see below), whose sum is σ = 117660928. Its totient is φ = 22234752.

The previous prime is 51881527. The next prime is 51881567. The reversal of 51881536 is 63518815.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 51881495 and 51881504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57456 + ... + 58351.

It is an arithmetic number, because the mean of its divisors is an integer number (4202176).

Almost surely, 2^51881536 is an apocalyptic number.

51881536 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51881536 is an abundant number, since it is smaller than the sum of its proper divisors (65779392).

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

51881536 is a wasteful number, since it uses less digits than its factorization.

51881536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115826 (or 115816 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 51881536 is about 7202.8838668966. The cubic root of 51881536 is about 372.9674590131.

It can be divided in two parts, 5188 and 1536, that added together give a square (6724 = 82²).

The spelling of 51881536 in words is "fifty-one million, eight hundred eighty-one thousand, five hundred thirty-six".