997087590 has 64 divisors (see below), whose sum is σ = 2668907520. Its totient is φ = 264889440.

The previous prime is 997087589. The next prime is 997087633. The reversal of 997087590 is 95780799.

997087590 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 66357 + ... + 79983.

It is an arithmetic number, because the mean of its divisors is an integer number (41701680).

Almost surely, 2^997087590 is an apocalyptic number.

997087590 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 997087590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1334453760).

997087590 is an abundant number, since it is smaller than the sum of its proper divisors (1671819930).

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

997087590 is a wasteful number, since it uses less digits than its factorization.

997087590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13914 (or 13908 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The square root of 997087590 is about 31576.6937787983. The cubic root of 997087590 is about 999.0282526797.

The spelling of 997087590 in words is "nine hundred ninety-seven million, eighty-seven thousand, five hundred ninety".