204428780 has 24 divisors (see below), whose sum is σ = 429837408. Its totient is φ = 81669248.

The previous prime is 204428773. The next prime is 204428839. The reversal of 204428780 is 87824402.

It is a super-2 number, since 2×204428780² = 83582252184576800, 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 204428780.

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, 11177 + ... + 23103.

It is an arithmetic number, because the mean of its divisors is an integer number (17909892).

Almost surely, 2^204428780 is an apocalyptic number.

204428780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204428780 is an abundant number, since it is smaller than the sum of its proper divisors (225408628).

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

204428780 is a wasteful number, since it uses less digits than its factorization.

204428780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12793 (or 12791 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 204428780 is about 14297.8592803258. The cubic root of 204428780 is about 589.0886821521.

The spelling of 204428780 in words is "two hundred four million, four hundred twenty-eight thousand, seven hundred eighty".