863919690 has 64 divisors (see below), whose sum is σ = 2123034624. Its totient is φ = 224890688.

The previous prime is 863919677. The next prime is 863919703. The reversal of 863919690 is 96919368.

It is an interprime number because it is at equal distance from previous prime (863919677) and next prime (863919703).

It is a super-2 number, since 2×863919690² = 1492714461539392200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 911797 + ... + 912743.

It is an arithmetic number, because the mean of its divisors is an integer number (33172416).

Almost surely, 2^863919690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863919690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061517312).

863919690 is an abundant number, since it is smaller than the sum of its proper divisors (1259114934).

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

863919690 is a wasteful number, since it uses less digits than its factorization.

863919690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 863919690 is about 29392.5107808095. The cubic root of 863919690 is about 952.4111200400.

The spelling of 863919690 in words is "eight hundred sixty-three million, nine hundred nineteen thousand, six hundred ninety".