428569491 has 16 divisors (see below), whose sum is σ = 687430400. Its totient is φ = 232007328.

The previous prime is 428569487. The next prime is 428569499. The reversal of 428569491 is 194965824.

It is not a de Polignac number, because 428569491 - 2² = 428569487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428569491.

It is not an unprimeable number, because it can be changed into a prime (428569499) 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, 536656 + ... + 537453.

It is an arithmetic number, because the mean of its divisors is an integer number (42964400).

Almost surely, 2^428569491 is an apocalyptic number.

428569491 is a deficient number, since it is larger than the sum of its proper divisors (258860909).

428569491 is a wasteful number, since it uses less digits than its factorization.

428569491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074138.

The product of its digits is 622080, while the sum is 48.

The square root of 428569491 is about 20701.9199834218. The cubic root of 428569491 is about 753.9463049286.

The spelling of 428569491 in words is "four hundred twenty-eight million, five hundred sixty-nine thousand, four hundred ninety-one".