428973569 has 4 divisors (see below), whose sum is σ = 429669444. Its totient is φ = 428277696.

The previous prime is 428973553. The next prime is 428973641. The reversal of 428973569 is 965379824.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 137827600 + 291145969 = 11740^2 + 17063^2 .

It is a cyclic number.

It is not a de Polignac number, because 428973569 - 2⁴ = 428973553 is a prime.

It is a super-2 number, since 2×428973569² = 368036645801195522, which contains 22 as substring.

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 428973569.

It is not an unprimeable number, because it can be changed into a prime (428973169) 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, 347012 + ... + 348245.

It is an arithmetic number, because the mean of its divisors is an integer number (107417361).

Almost surely, 2^428973569 is an apocalyptic number.

It is an amenable number.

428973569 is a deficient number, since it is larger than the sum of its proper divisors (695875).

428973569 is an equidigital number, since it uses as much as digits as its factorization.

428973569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695874.

The product of its digits is 3265920, while the sum is 53.

The square root of 428973569 is about 20711.6771170275. The cubic root of 428973569 is about 754.1831839909.

The spelling of 428973569 in words is "four hundred twenty-eight million, nine hundred seventy-three thousand, five hundred sixty-nine".