55816590 has 32 divisors (see below), whose sum is σ = 138581280. Its totient is φ = 14370944.

The previous prime is 55816583. The next prime is 55816597. The reversal of 55816590 is 9561855.

It is an interprime number because it is at equal distance from previous prime (55816583) and next prime (55816597).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55816597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31209 + ... + 32948.

It is an arithmetic number, because the mean of its divisors is an integer number (4330665).

Almost surely, 2^55816590 is an apocalyptic number.

55816590 is an abundant number, since it is smaller than the sum of its proper divisors (82764690).

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

55816590 is a wasteful number, since it uses less digits than its factorization.

55816590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64196.

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 55816590 is about 7471.0501269902. The cubic root of 55816590 is about 382.1681003168.

The spelling of 55816590 in words is "fifty-five million, eight hundred sixteen thousand, five hundred ninety".