55491408 has 60 divisors (see below), whose sum is σ = 177487648. Its totient is φ = 15854400.

The previous prime is 55491407. The next prime is 55491427. The reversal of 55491408 is 80419455.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55491407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26518 + ... + 28533.

Almost surely, 2^55491408 is an apocalyptic number.

It is an amenable number.

55491408 is an abundant number, since it is smaller than the sum of its proper divisors (121996240).

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

55491408 is a wasteful number, since it uses less digits than its factorization.

55491408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55072 (or 55063 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 55491408 is about 7449.2555332731. The cubic root of 55491408 is about 381.4244963825.

The spelling of 55491408 in words is "fifty-five million, four hundred ninety-one thousand, four hundred eight".