55447920 has 120 divisors (see below), whose sum is σ = 203170032. Its totient is φ = 13440000.

The previous prime is 55447919. The next prime is 55447943. The reversal of 55447920 is 2974455.

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

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 4420 + ... + 11420.

Almost surely, 2^55447920 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 55447920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101585016).

55447920 is an abundant number, since it is smaller than the sum of its proper divisors (147722112).

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

55447920 is a wasteful number, since it uses less digits than its factorization.

55447920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7031 (or 7022 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 55447920 is about 7446.3360117577. The cubic root of 55447920 is about 381.3248309622.

The spelling of 55447920 in words is "fifty-five million, four hundred forty-seven thousand, nine hundred twenty".