55591404 has 24 divisors (see below), whose sum is σ = 141505728. Its totient is φ = 16845840.

The previous prime is 55591399. The next prime is 55591409. The reversal of 55591404 is 40419555.

It is an interprime number because it is at equal distance from previous prime (55591399) and next prime (55591409).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (55591409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210442 + ... + 210705.

It is an arithmetic number, because the mean of its divisors is an integer number (5896072).

Almost surely, 2^55591404 is an apocalyptic number.

It is an amenable number.

55591404 is an abundant number, since it is smaller than the sum of its proper divisors (85914324).

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

55591404 is a wasteful number, since it uses less digits than its factorization.

55591404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421165 (or 421163 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 55591404 is about 7455.9643239490. The cubic root of 55591404 is about 381.6534689876.

The spelling of 55591404 in words is "fifty-five million, five hundred ninety-one thousand, four hundred four".