55499418 has 120 divisors (see below), whose sum is σ = 143281908. Its totient is φ = 15956352.

The previous prime is 55499401. The next prime is 55499419. The reversal of 55499418 is 81499455.

55499418 is a `hidden beast` number, since 5 + 549 + 94 + 18 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 54066609 + 1432809 = 7353^2 + 1197^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55499419) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 760230 + ... + 760302.

Almost surely, 2^55499418 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55499418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71640954).

55499418 is an abundant number, since it is smaller than the sum of its proper divisors (87782490).

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

55499418 is a wasteful number, since it uses less digits than its factorization.

55499418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 110 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 55499418 is about 7449.7931514909. The cubic root of 55499418 is about 381.4428479516.

The spelling of 55499418 in words is "fifty-five million, four hundred ninety-nine thousand, four hundred eighteen".