864835878 has 16 divisors (see below), whose sum is σ = 1771859376. Its totient is φ = 281247360.

The previous prime is 864835871. The next prime is 864835879. The reversal of 864835878 is 878538468.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864835871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1757551 + ... + 1758042.

It is an arithmetic number, because the mean of its divisors is an integer number (110741211).

Almost surely, 2^864835878 is an apocalyptic number.

864835878 is an abundant number, since it is smaller than the sum of its proper divisors (907023498).

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

864835878 is a wasteful number, since it uses less digits than its factorization.

864835878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3515639.

The product of its digits is 10321920, while the sum is 57.

The square root of 864835878 is about 29408.0920496383. The cubic root of 864835878 is about 952.7476788548.

The spelling of 864835878 in words is "eight hundred sixty-four million, eight hundred thirty-five thousand, eight hundred seventy-eight".