997691004 has 18 divisors (see below), whose sum is σ = 2521941240. Its totient is φ = 332563656.

The previous prime is 997690997. The next prime is 997691041. The reversal of 997691004 is 400196799.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13856784 + ... + 13856855.

Almost surely, 2^997691004 is an apocalyptic number.

It is an amenable number.

997691004 is an abundant number, since it is smaller than the sum of its proper divisors (1524250236).

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

997691004 is a wasteful number, since it uses less digits than its factorization.

997691004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27713649 (or 27713644 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 997691004 is about 31586.2470705211. The cubic root of 997691004 is about 999.2297415209.

The spelling of 997691004 in words is "nine hundred ninety-seven million, six hundred ninety-one thousand, four".