997657712 has 20 divisors (see below), whose sum is σ = 1959443040. Its totient is φ = 491995008.

The previous prime is 997657709. The next prime is 997657747. The reversal of 997657712 is 217756799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425912 + ... + 428247.

It is an arithmetic number, because the mean of its divisors is an integer number (97972152).

Almost surely, 2^997657712 is an apocalyptic number.

It is an amenable number.

997657712 is a deficient number, since it is larger than the sum of its proper divisors (961785328).

997657712 is a wasteful number, since it uses less digits than its factorization.

997657712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854240 (or 854234 counting only the distinct ones).

The product of its digits is 1666980, while the sum is 53.

The square root of 997657712 is about 31585.7200646115. The cubic root of 997657712 is about 999.2186269485.

The spelling of 997657712 in words is "nine hundred ninety-seven million, six hundred fifty-seven thousand, seven hundred twelve".