917028990 has 48 divisors (see below), whose sum is σ = 2406175200. Its totient is φ = 242294976.

The previous prime is 917028961. The next prime is 917029019. The reversal of 917028990 is 99820719.

917028990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (917028961) and next prime (917029019).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36930 + ... + 56549.

It is an arithmetic number, because the mean of its divisors is an integer number (50128650).

Almost surely, 2^917028990 is an apocalyptic number.

917028990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

917028990 is an abundant number, since it is smaller than the sum of its proper divisors (1489146210).

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

917028990 is a wasteful number, since it uses less digits than its factorization.

917028990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93601 (or 93598 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 917028990 is about 30282.4865227412. The cubic root of 917028990 is about 971.5407511434.

The spelling of 917028990 in words is "nine hundred seventeen million, twenty-eight thousand, nine hundred ninety".