428884091 has 4 divisors (see below), whose sum is σ = 434924784. Its totient is φ = 422843400.

The previous prime is 428884087. The next prime is 428884121. The reversal of 428884091 is 190488824.

It is a happy number.

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 428884091 - 2² = 428884087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428884591) 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, 3020240 + ... + 3020381.

It is an arithmetic number, because the mean of its divisors is an integer number (108731196).

Almost surely, 2^428884091 is an apocalyptic number.

428884091 is a deficient number, since it is larger than the sum of its proper divisors (6040693).

428884091 is an equidigital number, since it uses as much as digits as its factorization.

428884091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040692.

The product of its (nonzero) digits is 147456, while the sum is 44.

The square root of 428884091 is about 20709.5169185570. The cubic root of 428884091 is about 754.1307429236.

The spelling of 428884091 in words is "four hundred twenty-eight million, eight hundred eighty-four thousand, ninety-one".