55817280 has 84 divisors (see below), whose sum is σ = 191998092. Its totient is φ = 14883840.

The previous prime is 55817263. The next prime is 55817291. The reversal of 55817280 is 8271855.

55817280 is a `hidden beast` number, since 5 + 581 + 72 + 8 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 32080896 + 23736384 = 5664^2 + 4872^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6811 + ... + 12570.

Almost surely, 2^55817280 is an apocalyptic number.

It is an amenable number.

55817280 is an abundant number, since it is smaller than the sum of its proper divisors (136180812).

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

55817280 is a wasteful number, since it uses less digits than its factorization.

55817280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19404 (or 19391 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 55817280 is about 7471.0963050947. The cubic root of 55817280 is about 382.1696750870.

The spelling of 55817280 in words is "fifty-five million, eight hundred seventeen thousand, two hundred eighty".