204744878840 has 16 divisors (see below), whose sum is σ = 460675977480. Its totient is φ = 81897951520.

The previous prime is 204744878839. The next prime is 204744878843. The reversal of 204744878840 is 48878447402.

It is a super-2 number, since 2×204744878840² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204744878843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2559310946 + ... + 2559311025.

Almost surely, 2^204744878840 is an apocalyptic number.

204744878840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204744878840 is an abundant number, since it is smaller than the sum of its proper divisors (255931098640).

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

204744878840 is a wasteful number, since it uses less digits than its factorization.

204744878840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5118621982 (or 5118621978 counting only the distinct ones).

The product of its (nonzero) digits is 12845056, while the sum is 56.

The spelling of 204744878840 in words is "two hundred four billion, seven hundred forty-four million, eight hundred seventy-eight thousand, eight hundred forty".