55732728 has 32 divisors (see below), whose sum is σ = 141298560. Its totient is φ = 18315360.

The previous prime is 55732727. The next prime is 55732759. The reversal of 55732728 is 82723755.

It is a super-2 number, since 2×55732728² = 6212273940643968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55732727) 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, 14650 + ... + 18057.

It is an arithmetic number, because the mean of its divisors is an integer number (4415580).

Almost surely, 2^55732728 is an apocalyptic number.

It is an amenable number.

55732728 is an abundant number, since it is smaller than the sum of its proper divisors (85565832).

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

55732728 is a wasteful number, since it uses less digits than its factorization.

55732728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32787 (or 32783 counting only the distinct ones).

The product of its digits is 117600, while the sum is 39.

The square root of 55732728 is about 7465.4355532681. The cubic root of 55732728 is about 381.9766073959.

The spelling of 55732728 in words is "fifty-five million, seven hundred thirty-two thousand, seven hundred twenty-eight".