864781936 has 20 divisors (see below), whose sum is σ = 1684881000. Its totient is φ = 429973952.

The previous prime is 864781919. The next prime is 864781937. The reversal of 864781936 is 639187468.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864781937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148111 + ... + 153838.

It is an arithmetic number, because the mean of its divisors is an integer number (84244050).

Almost surely, 2^864781936 is an apocalyptic number.

It is an amenable number.

864781936 is a deficient number, since it is larger than the sum of its proper divisors (820099064).

864781936 is a wasteful number, since it uses less digits than its factorization.

864781936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302136 (or 302130 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 52.

The square root of 864781936 is about 29407.1749068148. The cubic root of 864781936 is about 952.7278700159.

The spelling of 864781936 in words is "eight hundred sixty-four million, seven hundred eighty-one thousand, nine hundred thirty-six".