55422720 has 216 divisors, whose sum is σ = 203754096. Its totient is φ = 13860864.

The previous prime is 55422713. The next prime is 55422733. The reversal of 55422720 is 2722455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 195699 + ... + 195981.

It is an arithmetic number, because the mean of its divisors is an integer number (943306).

Almost surely, 2^55422720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55422720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101877048).

55422720 is an abundant number, since it is smaller than the sum of its proper divisors (148331376).

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

55422720 is a wasteful number, since it uses less digits than its factorization.

55422720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 55422720 is about 7444.6437120926. The cubic root of 55422720 is about 381.2670539715.

The spelling of 55422720 in words is "fifty-five million, four hundred twenty-two thousand, seven hundred twenty".