997568090 has 8 divisors (see below), whose sum is σ = 1795622580. Its totient is φ = 399027232.

The previous prime is 997568059. The next prime is 997568107. The reversal of 997568090 is 90865799.

It can be written as a sum of positive squares in 2 ways, for example, as 996096721 + 1471369 = 31561^2 + 1213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49878395 + ... + 49878414.

Almost surely, 2^997568090 is an apocalyptic number.

997568090 is a deficient number, since it is larger than the sum of its proper divisors (798054490).

997568090 is a wasteful number, since it uses less digits than its factorization.

997568090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99756816.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 997568090 is about 31584.3013220176. The cubic root of 997568090 is about 999.1887053123.

The spelling of 997568090 in words is "nine hundred ninety-seven million, five hundred sixty-eight thousand, ninety".