55899720 has 160 divisors (see below), whose sum is σ = 191315520. Its totient is φ = 14696640.

The previous prime is 55899719. The next prime is 55899737. The reversal of 55899720 is 2799855.

It is a happy number.

55899720 is a `hidden beast` number, since 558 + 9 + 97 + 2 + 0 = 666.

55899720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 787285 + ... + 787355.

It is an arithmetic number, because the mean of its divisors is an integer number (1195722).

Almost surely, 2^55899720 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 55899720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95657760).

55899720 is an abundant number, since it is smaller than the sum of its proper divisors (135415800).

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

55899720 is an frugal number, since it uses more digits than its factorization.

55899720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 55899720 is about 7476.6115319709. The cubic root of 55899720 is about 382.3577325586.

The spelling of 55899720 in words is "fifty-five million, eight hundred ninety-nine thousand, seven hundred twenty".