55909280 has 48 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 19168512.

The previous prime is 55909253. The next prime is 55909283. The reversal of 55909280 is 8290955.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55909283) 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, 23840 + ... + 26079.

It is an arithmetic number, because the mean of its divisors is an integer number (3144960).

Almost surely, 2^55909280 is an apocalyptic number.

It is an amenable number.

55909280 is an abundant number, since it is smaller than the sum of its proper divisors (95048800).

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

55909280 is a wasteful number, since it uses less digits than its factorization.

55909280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49941 (or 49933 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 55909280 is about 7477.2508316894. The cubic root of 55909280 is about 382.3795283241.

The spelling of 55909280 in words is "fifty-five million, nine hundred nine thousand, two hundred eighty".