204064642 has 16 divisors (see below), whose sum is σ = 314214264. Its totient is φ = 99360000.

The previous prime is 204064639. The next prime is 204064669. The reversal of 204064642 is 246460402.

It can be written as a sum of positive squares in 4 ways, for example, as 121418361 + 82646281 = 11019^2 + 9091^2 .

It is a super-2 number, since 2×204064642² = 83284756229176328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204064642.

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, 4042 + ... + 20602.

Almost surely, 2^204064642 is an apocalyptic number.

204064642 is a deficient number, since it is larger than the sum of its proper divisors (110149622).

204064642 is a wasteful number, since it uses less digits than its factorization.

204064642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16725.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 204064642 is about 14285.1196004794. The cubic root of 204064642 is about 588.7387035997.

It can be divided in two parts, 20406464 and 2, that added together give a triangular number (20406466 = T₆₃₈₈).

The spelling of 204064642 in words is "two hundred four million, sixty-four thousand, six hundred forty-two".