204428787 has 8 divisors (see below), whose sum is σ = 281364480. Its totient is φ = 131889480.

The previous prime is 204428773. The next prime is 204428839. The reversal of 204428787 is 787824402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204428787 - 2⁷ = 204428659 is a prime.

It is a super-2 number, since 2×204428787² = 83582257908582738, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (204428717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1098987 + ... + 1099172.

It is an arithmetic number, because the mean of its divisors is an integer number (35170560).

Almost surely, 2^204428787 is an apocalyptic number.

204428787 is a deficient number, since it is larger than the sum of its proper divisors (76935693).

204428787 is a wasteful number, since it uses less digits than its factorization.

204428787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198193.

The product of its (nonzero) digits is 200704, while the sum is 42.

The square root of 204428787 is about 14297.8595251177. The cubic root of 204428787 is about 589.0886888759.

The spelling of 204428787 in words is "two hundred four million, four hundred twenty-eight thousand, seven hundred eighty-seven".