864253129878 has 24 divisors (see below), whose sum is σ = 1873797705000. Its totient is φ = 287892183264.

The previous prime is 864253129867. The next prime is 864253129907. The reversal of 864253129878 is 878921352468.

864253129878 is a `hidden beast` number, since 8 + 6 + 4 + 2 + 531 + 2 + 98 + 7 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15988383 + ... + 16042346.

It is an arithmetic number, because the mean of its divisors is an integer number (78074904375).

Almost surely, 2^864253129878 is an apocalyptic number.

864253129878 is an abundant number, since it is smaller than the sum of its proper divisors (1009544575122).

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

864253129878 is a wasteful number, since it uses less digits than its factorization.

864253129878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32032236 (or 32032233 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 864253129878 in words is "eight hundred sixty-four billion, two hundred fifty-three million, one hundred twenty-nine thousand, eight hundred seventy-eight".