865168290 has 160 divisors (see below), whose sum is σ = 2709780480. Its totient is φ = 193954176.

The previous prime is 865168273. The next prime is 865168309. The reversal of 865168290 is 92861568.

865168290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 299071 + ... + 301949.

It is an arithmetic number, because the mean of its divisors is an integer number (16936128).

Almost surely, 2^865168290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865168290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1354890240).

865168290 is an abundant number, since it is smaller than the sum of its proper divisors (1844612190).

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

865168290 is a wasteful number, since it uses less digits than its factorization.

865168290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 865168290 is about 29413.7432163946. The cubic root of 865168290 is about 952.8697306034.

The spelling of 865168290 in words is "eight hundred sixty-five million, one hundred sixty-eight thousand, two hundred ninety".