864840642 has 16 divisors (see below), whose sum is σ = 1735796640. Its totient is φ = 287260992.

The previous prime is 864840637. The next prime is 864840659. The reversal of 864840642 is 246048468.

864840642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 864840594 and 864840603.

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, 252967 + ... + 256362.

It is an arithmetic number, because the mean of its divisors is an integer number (108487290).

Almost surely, 2^864840642 is an apocalyptic number.

864840642 is an abundant number, since it is smaller than the sum of its proper divisors (870955998).

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

864840642 is a wasteful number, since it uses less digits than its factorization.

864840642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509617.

The product of its (nonzero) digits is 294912, while the sum is 42.

The square root of 864840642 is about 29408.1730476410. The cubic root of 864840642 is about 952.7494282740.

The spelling of 864840642 in words is "eight hundred sixty-four million, eight hundred forty thousand, six hundred forty-two".