55403520 has 88 divisors (see below), whose sum is σ = 177253824. Its totient is φ = 14770176.

The previous prime is 55403507. The next prime is 55403531. The reversal of 55403520 is 2530455.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13557 + ... + 17163.

It is an arithmetic number, because the mean of its divisors is an integer number (2014248).

Almost surely, 2^55403520 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 55403520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88626912).

55403520 is an abundant number, since it is smaller than the sum of its proper divisors (121850304).

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

55403520 is a wasteful number, since it uses less digits than its factorization.

55403520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635 (or 3617 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 55403520 is about 7443.3540826700. The cubic root of 55403520 is about 381.2230216510.

Adding to 55403520 its reverse (2530455), we get a palindrome (57933975).

The spelling of 55403520 in words is "fifty-five million, four hundred three thousand, five hundred twenty".