204090393864 has 128 divisors (see below), whose sum is σ = 590452208640. Its totient is φ = 57578610432.

The previous prime is 204090393851. The next prime is 204090393887. The reversal of 204090393864 is 468393090402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46668382 + ... + 46672754.

It is an arithmetic number, because the mean of its divisors is an integer number (4612907880).

Almost surely, 2^204090393864 is an apocalyptic number.

204090393864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204090393864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295226104320).

204090393864 is an abundant number, since it is smaller than the sum of its proper divisors (386361814776).

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

204090393864 is a wasteful number, since it uses less digits than its factorization.

204090393864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7819 (or 7815 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 48.

The spelling of 204090393864 in words is "two hundred four billion, ninety million, three hundred ninety-three thousand, eight hundred sixty-four".