55494720 has 140 divisors (see below), whose sum is σ = 197496684. Its totient is φ = 14791680.

The previous prime is 55494707. The next prime is 55494731. The reversal of 55494720 is 2749455.

It can be written as a sum of positive squares in 2 ways, for example, as 39237696 + 16257024 = 6264^2 + 4032^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24850 + ... + 26990.

Almost surely, 2^55494720 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 55494720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98748342).

55494720 is an abundant number, since it is smaller than the sum of its proper divisors (142001964).

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

55494720 is a wasteful number, since it uses less digits than its factorization.

55494720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170 (or 2151 counting only the distinct ones).

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

The square root of 55494720 is about 7449.4778340498. The cubic root of 55494720 is about 381.4320846611.

The spelling of 55494720 in words is "fifty-five million, four hundred ninety-four thousand, seven hundred twenty".