55280865 has 16 divisors (see below), whose sum is σ = 88545600. Its totient is φ = 29451072.

The previous prime is 55280777. The next prime is 55280867. The reversal of 55280865 is 56808255.

It is not a de Polignac number, because 55280865 - 2²² = 51086561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55280867) 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, 20146 + ... + 22724.

It is an arithmetic number, because the mean of its divisors is an integer number (5534100).

Almost surely, 2^55280865 is an apocalyptic number.

It is an amenable number.

55280865 is a deficient number, since it is larger than the sum of its proper divisors (33264735).

55280865 is a wasteful number, since it uses less digits than its factorization.

55280865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016.

The product of its (nonzero) digits is 96000, while the sum is 39.

The square root of 55280865 is about 7435.1102883548. The cubic root of 55280865 is about 380.9414904538.

The spelling of 55280865 in words is "fifty-five million, two hundred eighty thousand, eight hundred sixty-five".