55421910 has 24 divisors (see below), whose sum is σ = 144097200. Its totient is φ = 14779152.

The previous prime is 55421909. The next prime is 55421923. The reversal of 55421910 is 1912455.

55421910 is a `hidden beast` number, since 554 + 21 + 91 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307810 + ... + 307989.

It is an arithmetic number, because the mean of its divisors is an integer number (6004050).

Almost surely, 2^55421910 is an apocalyptic number.

55421910 is an abundant number, since it is smaller than the sum of its proper divisors (88675290).

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

55421910 is a wasteful number, since it uses less digits than its factorization.

55421910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615812 (or 615809 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 55421910 is about 7444.5893103649. The cubic root of 55421910 is about 381.2651965635.

The spelling of 55421910 in words is "fifty-five million, four hundred twenty-one thousand, nine hundred ten".