864187890 has 16 divisors (see below), whose sum is σ = 2074051008. Its totient is φ = 230450096.

The previous prime is 864187889. The next prime is 864187937. The reversal of 864187890 is 98781468.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14403102 + ... + 14403161.

It is an arithmetic number, because the mean of its divisors is an integer number (129628188).

Almost surely, 2^864187890 is an apocalyptic number.

864187890 is an abundant number, since it is smaller than the sum of its proper divisors (1209863118).

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

864187890 is a wasteful number, since it uses less digits than its factorization.

864187890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28806273.

The product of its (nonzero) digits is 774144, while the sum is 51.

The square root of 864187890 is about 29397.0728134622. The cubic root of 864187890 is about 952.5096670990.

The spelling of 864187890 in words is "eight hundred sixty-four million, one hundred eighty-seven thousand, eight hundred ninety".