868632690 has 32 divisors (see below), whose sum is σ = 2194441920. Its totient is φ = 219443904.

The previous prime is 868632649. The next prime is 868632703. The reversal of 868632690 is 96236868.

It is a super-2 number, since 2×868632690² = 1509045500273272200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 761389 + ... + 762528.

It is an arithmetic number, because the mean of its divisors is an integer number (68576310).

Almost surely, 2^868632690 is an apocalyptic number.

868632690 is an abundant number, since it is smaller than the sum of its proper divisors (1325809230).

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

868632690 is a wasteful number, since it uses less digits than its factorization.

868632690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523946.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 868632690 is about 29472.5752183280. The cubic root of 868632690 is about 954.1398979119.

The spelling of 868632690 in words is "eight hundred sixty-eight million, six hundred thirty-two thousand, six hundred ninety".