997541808 has 160 divisors (see below), whose sum is σ = 2771822592. Its totient is φ = 308582400.

The previous prime is 997541803. The next prime is 997541833. The reversal of 997541808 is 808145799.

It is not an unprimeable number, because it can be changed into a prime (997541801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5063566 + ... + 5063762.

Almost surely, 2^997541808 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 997541808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385911296).

997541808 is an abundant number, since it is smaller than the sum of its proper divisors (1774280784).

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

997541808 is a wasteful number, since it uses less digits than its factorization.

997541808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 997541808 is about 31583.8852581502. The cubic root of 997541808 is about 999.1799303362.

The spelling of 997541808 in words is "nine hundred ninety-seven million, five hundred forty-one thousand, eight hundred eight".