997757864 has 8 divisors (see below), whose sum is σ = 1870796010. Its totient is φ = 498878928.

The previous prime is 997757821. The next prime is 997757867. The reversal of 997757864 is 468757799.

It can be written as a sum of positive squares in only one way, i.e., 989102500 + 8655364 = 31450^2 + 2942^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 997757797 and 997757806.

It is not an unprimeable number, because it can be changed into a prime (997757867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62359859 + ... + 62359874.

Almost surely, 2^997757864 is an apocalyptic number.

It is an amenable number.

997757864 is a deficient number, since it is larger than the sum of its proper divisors (873038146).

997757864 is a wasteful number, since it uses less digits than its factorization.

997757864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124719739 (or 124719735 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 62.

The square root of 997757864 is about 31587.3054248063. The cubic root of 997757864 is about 999.2520620616.

The spelling of 997757864 in words is "nine hundred ninety-seven million, seven hundred fifty-seven thousand, eight hundred sixty-four".