55588890 has 64 divisors (see below), whose sum is σ = 157409280. Its totient is φ = 12294720.

The previous prime is 55588867. The next prime is 55588913. The reversal of 55588890 is 9888555.

It is an interprime number because it is at equal distance from previous prime (55588867) and next prime (55588913).

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, 2241 + ... + 10779.

It is an arithmetic number, because the mean of its divisors is an integer number (2459520).

Almost surely, 2^55588890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55588890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78704640).

55588890 is an abundant number, since it is smaller than the sum of its proper divisors (101820390).

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

55588890 is a wasteful number, since it uses less digits than its factorization.

55588890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8587.

The product of its (nonzero) digits is 576000, while the sum is 48.

The square root of 55588890 is about 7455.7957321804. The cubic root of 55588890 is about 381.6477157523.

The spelling of 55588890 in words is "fifty-five million, five hundred eighty-eight thousand, eight hundred ninety".