864822040 has 32 divisors (see below), whose sum is σ = 1947816000. Its totient is φ = 345579264.

The previous prime is 864822029. The next prime is 864822089. The reversal of 864822040 is 40228468.

It is a junction number, because it is equal to n+sod(n) for n = 864821987 and 864822005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31156 + ... + 51964.

It is an arithmetic number, because the mean of its divisors is an integer number (60869250).

Almost surely, 2^864822040 is an apocalyptic number.

It is an amenable number.

864822040 is an abundant number, since it is smaller than the sum of its proper divisors (1082993960).

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

864822040 is a wasteful number, since it uses less digits than its factorization.

864822040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21859 (or 21855 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 864822040 is about 29407.8567733182. The cubic root of 864822040 is about 952.7425972769.

The spelling of 864822040 in words is "eight hundred sixty-four million, eight hundred twenty-two thousand, forty".