864363780 has 72 divisors (see below), whose sum is σ = 2996465472. Its totient is φ = 197568576.

The previous prime is 864363779. The next prime is 864363823. The reversal of 864363780 is 87363468.

864363780 is a `hidden beast` number, since 8 + 6 + 4 + 3 + 637 + 8 + 0 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 341742 + ... + 344261.

It is an arithmetic number, because the mean of its divisors is an integer number (41617576).

Almost surely, 2^864363780 is an apocalyptic number.

It is an amenable number.

864363780 is an abundant number, since it is smaller than the sum of its proper divisors (2132101692).

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

864363780 is a wasteful number, since it uses less digits than its factorization.

864363780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686025 (or 686020 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 864363780 is about 29400.0642856440. The cubic root of 864363780 is about 952.5742848217.

The spelling of 864363780 in words is "eight hundred sixty-four million, three hundred sixty-three thousand, seven hundred eighty".