864688969 has 16 divisors (see below), whose sum is σ = 962683920. Its totient is φ = 772853760.

The previous prime is 864688963. The next prime is 864688999. The reversal of 864688969 is 969886468.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 11289600 + 853399369 = 3360^2 + 29213^2 .

It is a cyclic number.

It is not a de Polignac number, because 864688969 - 2⁹ = 864688457 is a prime.

It is a super-2 number, since 2×864688969² = 1495374026220565922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 864688969.

It is not an unprimeable number, because it can be changed into a prime (864688963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15697 + ... + 44449.

It is an arithmetic number, because the mean of its divisors is an integer number (60167745).

Almost surely, 2^864688969 is an apocalyptic number.

It is an amenable number.

864688969 is a deficient number, since it is larger than the sum of its proper divisors (97994951).

864688969 is a wasteful number, since it uses less digits than its factorization.

864688969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28860.

The product of its digits is 35831808, while the sum is 64.

The square root of 864688969 is about 29405.5941786593. The cubic root of 864688969 is about 952.6937282967.

The spelling of 864688969 in words is "eight hundred sixty-four million, six hundred eighty-eight thousand, nine hundred sixty-nine".