997807668 has 48 divisors (see below), whose sum is σ = 2735253696. Its totient is φ = 279106560.

The previous prime is 997807661. The next prime is 997807687. The reversal of 997807668 is 866708799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997807661) 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 15 ways as a sum of consecutive naturals, for example, 289021 + ... + 292452.

It is an arithmetic number, because the mean of its divisors is an integer number (56984452).

Almost surely, 2^997807668 is an apocalyptic number.

It is an amenable number.

997807668 is an abundant number, since it is smaller than the sum of its proper divisors (1737446028).

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

997807668 is a wasteful number, since it uses less digits than its factorization.

997807668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581504 (or 581502 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 60.

The square root of 997807668 is about 31588.0937696468. The cubic root of 997807668 is about 999.2686879798.

The spelling of 997807668 in words is "nine hundred ninety-seven million, eight hundred seven thousand, six hundred sixty-eight".