55636728 has 32 divisors (see below), whose sum is σ = 158962560. Its totient is φ = 15896160.

The previous prime is 55636663. The next prime is 55636729. The reversal of 55636728 is 82763655.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 55636728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55636729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165418 + ... + 165753.

It is an arithmetic number, because the mean of its divisors is an integer number (4967580).

Almost surely, 2^55636728 is an apocalyptic number.

It is an amenable number.

55636728 is an abundant number, since it is smaller than the sum of its proper divisors (103325832).

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

55636728 is a wasteful number, since it uses less digits than its factorization.

55636728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331187 (or 331183 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 55636728 is about 7459.0031505557. The cubic root of 55636728 is about 381.7571622546.

The spelling of 55636728 in words is "fifty-five million, six hundred thirty-six thousand, seven hundred twenty-eight".