864156420 has 72 divisors (see below), whose sum is σ = 2624783616. Its totient is φ = 230133312.

The previous prime is 864156401. The next prime is 864156451. The reversal of 864156420 is 24651468.

864156420 is a `hidden beast` number, since 8 + 6 + 4 + 1 + 5 + 642 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152559 + ... + 158121.

It is an arithmetic number, because the mean of its divisors is an integer number (36455328).

Almost surely, 2^864156420 is an apocalyptic number.

It is an amenable number.

864156420 is an abundant number, since it is smaller than the sum of its proper divisors (1760627196).

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

864156420 is a wasteful number, since it uses less digits than its factorization.

864156420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441 (or 6436 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 864156420 is about 29396.5375512151. The cubic root of 864156420 is about 952.4981048591.

The spelling of 864156420 in words is "eight hundred sixty-four million, one hundred fifty-six thousand, four hundred twenty".