55509412 has 48 divisors (see below), whose sum is σ = 117806080. Its totient is φ = 22356000.

The previous prime is 55509409. The next prime is 55509427. The reversal of 55509412 is 21490555.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 79987 + ... + 80677.

Almost surely, 2^55509412 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 55509412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58903040).

55509412 is an abundant number, since it is smaller than the sum of its proper divisors (62296668).

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

55509412 is a wasteful number, since it uses less digits than its factorization.

55509412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872 (or 870 counting only the distinct ones).

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

The square root of 55509412 is about 7450.4638781756. The cubic root of 55509412 is about 381.4657425522.

Adding to 55509412 its reverse (21490555), we get a palindrome (76999967).

The spelling of 55509412 in words is "fifty-five million, five hundred nine thousand, four hundred twelve".