55431720 has 96 divisors (see below), whose sum is σ = 186001920. Its totient is φ = 14302080.

The previous prime is 55431703. The next prime is 55431767. The reversal of 55431720 is 2713455.

It is a happy 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, 8677 + ... + 13643.

It is an arithmetic number, because the mean of its divisors is an integer number (1937520).

Almost surely, 2^55431720 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 55431720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93000960).

55431720 is an abundant number, since it is smaller than the sum of its proper divisors (130570200).

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

55431720 is a wasteful number, since it uses less digits than its factorization.

55431720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5015 (or 5008 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 55431720 is about 7445.2481489874. The cubic root of 55431720 is about 381.2876906212.

The spelling of 55431720 in words is "fifty-five million, four hundred thirty-one thousand, seven hundred twenty".