55491828 has 24 divisors (see below), whose sum is σ = 147978432. Its totient is φ = 15854784.

The previous prime is 55491827. The next prime is 55491841. The reversal of 55491828 is 82819455.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 55491828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55491827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330225 + ... + 330392.

It is an arithmetic number, because the mean of its divisors is an integer number (6165768).

Almost surely, 2^55491828 is an apocalyptic number.

It is an amenable number.

55491828 is an abundant number, since it is smaller than the sum of its proper divisors (92486604).

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

55491828 is a wasteful number, since it uses less digits than its factorization.

55491828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660631 (or 660629 counting only the distinct ones).

The product of its digits is 115200, while the sum is 42.

The square root of 55491828 is about 7449.2837239563. The cubic root of 55491828 is about 381.4254586809.

The spelling of 55491828 in words is "fifty-five million, four hundred ninety-one thousand, eight hundred twenty-eight".