55408280 has 32 divisors (see below), whose sum is σ = 125591040. Its totient is φ = 21999360.

The previous prime is 55408279. The next prime is 55408291. The reversal of 55408280 is 8280455.

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, 425 + ... + 10535.

It is an arithmetic number, because the mean of its divisors is an integer number (3924720).

Almost surely, 2^55408280 is an apocalyptic number.

It is an amenable number.

55408280 is an abundant number, since it is smaller than the sum of its proper divisors (70182760).

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

55408280 is a wasteful number, since it uses less digits than its factorization.

55408280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10259 (or 10255 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 55408280 is about 7443.6738241274. The cubic root of 55408280 is about 381.2339389454.

The spelling of 55408280 in words is "fifty-five million, four hundred eight thousand, two hundred eighty".