51636544 has 14 divisors (see below), whose sum is σ = 102466394. Its totient is φ = 25818240.

The previous prime is 51636539. The next prime is 51636551. The reversal of 51636544 is 44563615.

It can be written as a sum of positive squares in only one way, i.e., 32626944 + 19009600 = 5712^2 + 4360^2 .

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 as a sum of consecutive naturals, namely, 403347 + ... + 403474.

Almost surely, 2^51636544 is an apocalyptic number.

It is an amenable number.

51636544 is a deficient number, since it is larger than the sum of its proper divisors (50829850).

51636544 is an equidigital number, since it uses as much as digits as its factorization.

51636544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806833 (or 806823 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 51636544 is about 7185.8572209584. The cubic root of 51636544 is about 372.3794640258.

The spelling of 51636544 in words is "fifty-one million, six hundred thirty-six thousand, five hundred forty-four".