699172864 has 48 divisors (see below), whose sum is σ = 1505600460. Its totient is φ = 322682880.

The previous prime is 699172847. The next prime is 699172867. The reversal of 699172864 is 468271996.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 508953600 + 190219264 = 22560^2 + 13792^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (699172867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13494 + ... + 39754.

Almost surely, 2^699172864 is an apocalyptic number.

699172864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 699172864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752800230).

699172864 is an abundant number, since it is smaller than the sum of its proper divisors (806427596).

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

699172864 is a wasteful number, since it uses less digits than its factorization.

699172864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26296 (or 26276 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 699172864 is about 26441.8770891932. The cubic root of 699172864 is about 887.5541413509.

The spelling of 699172864 in words is "six hundred ninety-nine million, one hundred seventy-two thousand, eight hundred sixty-four".