55903920 has 80 divisors (see below), whose sum is σ = 174973920. Its totient is φ = 14764032.

The previous prime is 55903907. The next prime is 55903927. The reversal of 55903920 is 2930955.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (55903927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25092 + ... + 27228.

It is an arithmetic number, because the mean of its divisors is an integer number (2187174).

Almost surely, 2^55903920 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 55903920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87486960).

55903920 is an abundant number, since it is smaller than the sum of its proper divisors (119070000).

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

55903920 is a wasteful number, since it uses less digits than its factorization.

55903920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262 (or 2256 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 33.

The square root of 55903920 is about 7476.8924025961. The cubic root of 55903920 is about 382.3673084101.

The spelling of 55903920 in words is "fifty-five million, nine hundred three thousand, nine hundred twenty".