55404720 has 120 divisors (see below), whose sum is σ = 212667936. Its totient is φ = 12662784.

The previous prime is 55404697. The next prime is 55404731. The reversal of 55404720 is 2740455.

It is a tau number, because it is divible by the number of its divisors (120).

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, 457 + ... + 10536.

Almost surely, 2^55404720 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 55404720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106333968).

55404720 is an abundant number, since it is smaller than the sum of its proper divisors (157263216).

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

55404720 is a wasteful number, since it uses less digits than its factorization.

55404720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11019 (or 11010 counting only the distinct ones).

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

The square root of 55404720 is about 7443.4346910549. The cubic root of 55404720 is about 381.2257739690.

The spelling of 55404720 in words is "fifty-five million, four hundred four thousand, seven hundred twenty".