864897668 has 12 divisors (see below), whose sum is σ = 1514335452. Its totient is φ = 432230400.

The previous prime is 864897659. The next prime is 864897673. The reversal of 864897668 is 866798468.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 372412804 + 492484864 = 19298^2 + 22192^2 .

It is a super-2 number, since 2×864897668² = 1496095952223676448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 864897668.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45533 + ... + 61668.

It is an arithmetic number, because the mean of its divisors is an integer number (126194621).

Almost surely, 2^864897668 is an apocalyptic number.

It is an amenable number.

864897668 is a deficient number, since it is larger than the sum of its proper divisors (649437784).

864897668 is a wasteful number, since it uses less digits than its factorization.

864897668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109222 (or 109220 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 62.

The square root of 864897668 is about 29409.1425920580. The cubic root of 864897668 is about 952.7703686616.

The spelling of 864897668 in words is "eight hundred sixty-four million, eight hundred ninety-seven thousand, six hundred sixty-eight".