55309280 has 48 divisors (see below), whose sum is σ = 140724864. Its totient is φ = 20421120.

The previous prime is 55309277. The next prime is 55309297. The reversal of 55309280 is 8290355.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11216 + ... + 15375.

It is an arithmetic number, because the mean of its divisors is an integer number (2931768).

Almost surely, 2^55309280 is an apocalyptic number.

It is an amenable number.

55309280 is an abundant number, since it is smaller than the sum of its proper divisors (85415584).

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

55309280 is a wasteful number, since it uses less digits than its factorization.

55309280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26619 (or 26611 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 55309280 is about 7437.0209089393. The cubic root of 55309280 is about 381.0067487088.

The spelling of 55309280 in words is "fifty-five million, three hundred nine thousand, two hundred eighty".