868490784 has 72 divisors (see below), whose sum is σ = 2822601600. Its totient is φ = 248139648.

The previous prime is 868490771. The next prime is 868490789. The reversal of 868490784 is 487094868.

868490784 is a `hidden beast` number, since 86 + 8 + 490 + 78 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 868490784.

It is not an unprimeable number, because it can be changed into a prime (868490789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213384 + ... + 217415.

It is an arithmetic number, because the mean of its divisors is an integer number (39202800).

Almost surely, 2^868490784 is an apocalyptic number.

868490784 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

868490784 is an abundant number, since it is smaller than the sum of its proper divisors (1954110816).

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

868490784 is a wasteful number, since it uses less digits than its factorization.

868490784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430822 (or 430811 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The square root of 868490784 is about 29470.1676954849. The cubic root of 868490784 is about 954.0879367274.

The spelling of 868490784 in words is "eight hundred sixty-eight million, four hundred ninety thousand, seven hundred eighty-four".