55772688 has 20 divisors (see below), whose sum is σ = 144079568. Its totient is φ = 18590880.

The previous prime is 55772687. The next prime is 55772711. The reversal of 55772688 is 88627755.

It is a super-2 number, since 2×55772688² = 6221185453490688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1161931 = 55772688 / (5 + 5 + 7 + 7 + 2 + 6 + 8 + 8).

It is not an unprimeable number, because it can be changed into a prime (55772681) 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, 580918 + ... + 581013.

Almost surely, 2^55772688 is an apocalyptic number.

It is an amenable number.

55772688 is an abundant number, since it is smaller than the sum of its proper divisors (88306880).

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

55772688 is a wasteful number, since it uses less digits than its factorization.

55772688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161942 (or 1161936 counting only the distinct ones).

The product of its digits is 940800, while the sum is 48.

The square root of 55772688 is about 7468.1114078460. Note that the first 3 decimals coincide. The cubic root of 55772688 is about 382.0678771591.

The spelling of 55772688 in words is "fifty-five million, seven hundred seventy-two thousand, six hundred eighty-eight".