55780923 has 16 divisors (see below), whose sum is σ = 81273600. Its totient is φ = 33749280.

The previous prime is 55780889. The next prime is 55780931. The reversal of 55780923 is 32908755.

It is not a de Polignac number, because 55780923 - 2⁹ = 55780411 is a prime.

It is a super-2 number, since 2×55780923² = 6223022741463858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55780943) 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, 26338 + ... + 28376.

It is an arithmetic number, because the mean of its divisors is an integer number (5079600).

Almost surely, 2^55780923 is an apocalyptic number.

55780923 is a deficient number, since it is larger than the sum of its proper divisors (25492677).

55780923 is a wasteful number, since it uses less digits than its factorization.

55780923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 55780923 is about 7468.6627317077. The cubic root of 55780923 is about 382.0866807124.

The spelling of 55780923 in words is "fifty-five million, seven hundred eighty thousand, nine hundred twenty-three".