428205261 has 16 divisors (see below), whose sum is σ = 655626240. Its totient is φ = 245859120.

The previous prime is 428205259. The next prime is 428205311. The reversal of 428205261 is 162502824.

It is not a de Polignac number, because 428205261 - 2¹ = 428205259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428205361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340845 + ... + 342098.

It is an arithmetic number, because the mean of its divisors is an integer number (40976640).

Almost surely, 2^428205261 is an apocalyptic number.

It is an amenable number.

428205261 is a deficient number, since it is larger than the sum of its proper divisors (227420979).

428205261 is a wasteful number, since it uses less digits than its factorization.

428205261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682976.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 428205261 is about 20693.1211034005. The cubic root of 428205261 is about 753.7326579785.

The spelling of 428205261 in words is "four hundred twenty-eight million, two hundred five thousand, two hundred sixty-one".