55240556 has 48 divisors (see below), whose sum is σ = 115218432. Its totient is φ = 22680000.

The previous prime is 55240547. The next prime is 55240589. The reversal of 55240556 is 65504255.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73181 + ... + 73931.

It is an arithmetic number, because the mean of its divisors is an integer number (2400384).

Almost surely, 2^55240556 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 55240556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57609216).

55240556 is an abundant number, since it is smaller than the sum of its proper divisors (59977876).

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

55240556 is a wasteful number, since it uses less digits than its factorization.

55240556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 32.

The square root of 55240556 is about 7432.3990743232. The cubic root of 55240556 is about 380.8488779120.

The spelling of 55240556 in words is "fifty-five million, two hundred forty thousand, five hundred fifty-six".