428116565 has 4 divisors (see below), whose sum is σ = 513739884. Its totient is φ = 342493248.

The previous prime is 428116553. The next prime is 428116571. The reversal of 428116565 is 565611824.

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 64032004 + 364084561 = 8002^2 + 19081^2 .

It is a cyclic number.

It is not a de Polignac number, because 428116565 - 2¹² = 428112469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42811652 + ... + 42811661.

It is an arithmetic number, because the mean of its divisors is an integer number (128434971).

Almost surely, 2^428116565 is an apocalyptic number.

It is an amenable number.

428116565 is a deficient number, since it is larger than the sum of its proper divisors (85623319).

428116565 is an equidigital number, since it uses as much as digits as its factorization.

428116565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85623318.

The product of its digits is 57600, while the sum is 38.

The square root of 428116565 is about 20690.9778647603. The cubic root of 428116565 is about 753.6806130877.

The spelling of 428116565 in words is "four hundred twenty-eight million, one hundred sixteen thousand, five hundred sixty-five".