204487128 has 48 divisors (see below), whose sum is σ = 562910400. Its totient is φ = 67043520.

The previous prime is 204487121. The next prime is 204487133. The reversal of 204487128 is 821784402.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 204487092 and 204487101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204487121) 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, 18888 + ... + 27671.

It is an arithmetic number, because the mean of its divisors is an integer number (11727300).

Almost surely, 2^204487128 is an apocalyptic number.

It is an amenable number.

204487128 is an abundant number, since it is smaller than the sum of its proper divisors (358423272).

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

204487128 is a wasteful number, since it uses less digits than its factorization.

204487128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46632 (or 46625 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 204487128 is about 14299.8995800670. The cubic root of 204487128 is about 589.1447226581.

The spelling of 204487128 in words is "two hundred four million, four hundred eighty-seven thousand, one hundred twenty-eight".