864487780 has 48 divisors (see below), whose sum is σ = 1958491584. Its totient is φ = 318637440.

The previous prime is 864487777. The next prime is 864487787. The reversal of 864487780 is 87784468.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (864487787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164595 + ... + 169765.

It is an arithmetic number, because the mean of its divisors is an integer number (40801908).

Almost surely, 2^864487780 is an apocalyptic number.

It is an amenable number.

864487780 is an abundant number, since it is smaller than the sum of its proper divisors (1094003804).

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

864487780 is a wasteful number, since it uses less digits than its factorization.

864487780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5836 (or 5834 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 52.

The square root of 864487780 is about 29402.1730489432. The cubic root of 864487780 is about 952.6198341479.

The spelling of 864487780 in words is "eight hundred sixty-four million, four hundred eighty-seven thousand, seven hundred eighty".