55994220 has 96 divisors (see below), whose sum is σ = 176164800. Its totient is φ = 14764032.

The previous prime is 55994201. The next prime is 55994231. The reversal of 55994220 is 2249955.

It is a happy number.

55994220 is a `hidden beast` number, since 5 + 599 + 42 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51846 + ... + 52914.

It is an arithmetic number, because the mean of its divisors is an integer number (1835050).

Almost surely, 2^55994220 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 55994220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88082400).

55994220 is an abundant number, since it is smaller than the sum of its proper divisors (120170580).

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

55994220 is a wasteful number, since it uses less digits than its factorization.

55994220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 55994220 is about 7482.9285710877. The cubic root of 55994220 is about 382.5730733132.

The spelling of 55994220 in words is "fifty-five million, nine hundred ninety-four thousand, two hundred twenty".