864842020 has 48 divisors (see below), whose sum is σ = 2197722240. Its totient is φ = 279074304.

The previous prime is 864841979. The next prime is 864842063. The reversal of 864842020 is 20248468.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

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, 179310 + ... + 184069.

It is an arithmetic number, because the mean of its divisors is an integer number (45785880).

Almost surely, 2^864842020 is an apocalyptic number.

It is an amenable number.

864842020 is an abundant number, since it is smaller than the sum of its proper divisors (1332880220).

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

864842020 is a wasteful number, since it uses less digits than its factorization.

864842020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363412 (or 363410 counting only the distinct ones).

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

The square root of 864842020 is about 29408.1964764927. The cubic root of 864842020 is about 952.7499342971.

The spelling of 864842020 in words is "eight hundred sixty-four million, eight hundred forty-two thousand, twenty".