864797278 has 4 divisors (see below), whose sum is σ = 1297195920. Its totient is φ = 432398638.

The previous prime is 864797251. The next prime is 864797281. The reversal of 864797278 is 872797468.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216199318 + ... + 216199321.

It is an arithmetic number, because the mean of its divisors is an integer number (324298980).

Almost surely, 2^864797278 is an apocalyptic number.

864797278 is a deficient number, since it is larger than the sum of its proper divisors (432398642).

864797278 is a wasteful number, since it uses less digits than its factorization.

864797278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432398641.

The product of its digits is 9483264, while the sum is 58.

The square root of 864797278 is about 29407.4357603651. The cubic root of 864797278 is about 952.7335040622.

The spelling of 864797278 in words is "eight hundred sixty-four million, seven hundred ninety-seven thousand, two hundred seventy-eight".