868864278 has 64 divisors (see below), whose sum is σ = 1840988160. Its totient is φ = 273061152.

The previous prime is 868864259. The next prime is 868864291. The reversal of 868864278 is 872468868.

It is a happy number.

868864278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×868864278² = 1509850267168922568, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 957501 + ... + 958407.

It is an arithmetic number, because the mean of its divisors is an integer number (28765440).

Almost surely, 2^868864278 is an apocalyptic number.

868864278 is an abundant number, since it is smaller than the sum of its proper divisors (972123882).

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

868864278 is a wasteful number, since it uses less digits than its factorization.

868864278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081.

The product of its digits is 8257536, while the sum is 57.

The square root of 868864278 is about 29476.5038293214. The cubic root of 868864278 is about 954.2246854631.

The spelling of 868864278 in words is "eight hundred sixty-eight million, eight hundred sixty-four thousand, two hundred seventy-eight".