55731636 has 72 divisors (see below), whose sum is σ = 150914400. Its totient is φ = 17288640.

The previous prime is 55731623. The next prime is 55731647. The reversal of 55731636 is 63613755.

It is a happy number.

55731636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 55731636.

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 23 ways as a sum of consecutive naturals, for example, 39666 + ... + 41046.

Almost surely, 2^55731636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55731636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75457200).

55731636 is an abundant number, since it is smaller than the sum of its proper divisors (95182764).

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

55731636 is a wasteful number, since it uses less digits than its factorization.

55731636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469 (or 1464 counting only the distinct ones).

The product of its digits is 56700, while the sum is 36.

The square root of 55731636 is about 7465.3624158510. The cubic root of 55731636 is about 381.9741126249.

The spelling of 55731636 in words is "fifty-five million, seven hundred thirty-one thousand, six hundred thirty-six".