55727720 has 16 divisors (see below), whose sum is σ = 125387460. Its totient is φ = 22291072.

The previous prime is 55727681. The next prime is 55727729. The reversal of 55727720 is 2772755.

It can be written as a sum of positive squares in 2 ways, for example, as 47582404 + 8145316 = 6898^2 + 2854^2 .

It is not an unprimeable number, because it can be changed into a prime (55727729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696557 + ... + 696636.

Almost surely, 2^55727720 is an apocalyptic number.

It is an amenable number.

55727720 is an abundant number, since it is smaller than the sum of its proper divisors (69659740).

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

55727720 is a wasteful number, since it uses less digits than its factorization.

55727720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393204 (or 1393200 counting only the distinct ones).

The product of its (nonzero) digits is 34300, while the sum is 35.

The square root of 55727720 is about 7465.1001332869. The cubic root of 55727720 is about 381.9651659071.

The spelling of 55727720 in words is "fifty-five million, seven hundred twenty-seven thousand, seven hundred twenty".