55780272 has 40 divisors (see below), whose sum is σ = 160111280. Its totient is φ = 18593280.

The previous prime is 55780261. The next prime is 55780273. The reversal of 55780272 is 27208755.

55780272 is a `hidden beast` number, since 557 + 80 + 27 + 2 = 666.

It is a super-2 number, since 2×55780272² = 6222877488787968, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (55780273) 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, 64129 + ... + 64992.

It is an arithmetic number, because the mean of its divisors is an integer number (4002782).

Almost surely, 2^55780272 is an apocalyptic number.

It is an amenable number.

55780272 is an abundant number, since it is smaller than the sum of its proper divisors (104331008).

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

55780272 is a wasteful number, since it uses less digits than its factorization.

55780272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129138 (or 129126 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 55780272 is about 7468.6191494814. The cubic root of 55780272 is about 382.0851943058.

The spelling of 55780272 in words is "fifty-five million, seven hundred eighty thousand, two hundred seventy-two".