204570090 has 128 divisors (see below), whose sum is σ = 563915520. Its totient is φ = 52752384.

The previous prime is 204570071. The next prime is 204570103. The reversal of 204570090 is 90075402.

204570090 is a `hidden beast` number, since 2 + 0 + 4 + 570 + 0 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1911817 + ... + 1911923.

It is an arithmetic number, because the mean of its divisors is an integer number (4405590).

Almost surely, 2^204570090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204570090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281957760).

204570090 is an abundant number, since it is smaller than the sum of its proper divisors (359345430).

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

204570090 is a wasteful number, since it uses less digits than its factorization.

204570090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 204570090 is about 14302.8000755097. The cubic root of 204570090 is about 589.2243854003.

The spelling of 204570090 in words is "two hundred four million, five hundred seventy thousand, ninety".