428908091 has 4 divisors (see below), whose sum is σ = 429123384. Its totient is φ = 428692800.

The previous prime is 428908063. The next prime is 428908097. The reversal of 428908091 is 190809824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428908091 - 2¹⁴ = 428891707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428908097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104630 + ... + 108651.

It is an arithmetic number, because the mean of its divisors is an integer number (107280846).

Almost surely, 2^428908091 is an apocalyptic number.

428908091 is a deficient number, since it is larger than the sum of its proper divisors (215293).

428908091 is a wasteful number, since it uses less digits than its factorization.

428908091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215292.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 428908091 is about 20710.0963541940. The cubic root of 428908091 is about 754.1448095060.

The spelling of 428908091 in words is "four hundred twenty-eight million, nine hundred eight thousand, ninety-one".