55491520 has 84 divisors (see below), whose sum is σ = 153756360. Its totient is φ = 19020288.

The previous prime is 55491497. The next prime is 55491539. The reversal of 55491520 is 2519455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13911 + ... + 17449.

Almost surely, 2^55491520 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 55491520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76878180).

55491520 is an abundant number, since it is smaller than the sum of its proper divisors (98264840).

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

55491520 is a wasteful number, since it uses less digits than its factorization.

55491520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570 (or 3553 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 55491520 is about 7449.2630507991. The cubic root of 55491520 is about 381.4247529959.

It can be divided in two parts, 5 and 5491520, that multiplied together give a square (27457600 = 5240²).

The spelling of 55491520 in words is "fifty-five million, four hundred ninety-one thousand, five hundred twenty".