55780872 has 64 divisors (see below), whose sum is σ = 159928320. Its totient is φ = 15882048.

The previous prime is 55780861. The next prime is 55780877. The reversal of 55780872 is 27808755.

It is a happy number.

It is a super-2 number, since 2×55780872² = 6223011362160768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (55780877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91593 + ... + 92199.

It is an arithmetic number, because the mean of its divisors is an integer number (2498880).

Almost surely, 2^55780872 is an apocalyptic number.

It is an amenable number.

55780872 is an abundant number, since it is smaller than the sum of its proper divisors (104147448).

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

55780872 is a wasteful number, since it uses less digits than its factorization.

55780872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 55780872 is about 7468.6593174411. The cubic root of 55780872 is about 382.0865642662.

The spelling of 55780872 in words is "fifty-five million, seven hundred eighty thousand, eight hundred seventy-two".