28831565 has 8 divisors (see below), whose sum is σ = 39540480. Its totient is φ = 19770192.

The previous prime is 28831511. The next prime is 28831573. The reversal of 28831565 is 56513882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28831565 - 2⁶ = 28831501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411845 + ... + 411914.

It is an arithmetic number, because the mean of its divisors is an integer number (4942560).

Almost surely, 2^28831565 is an apocalyptic number.

It is an amenable number.

28831565 is a deficient number, since it is larger than the sum of its proper divisors (10708915).

28831565 is an equidigital number, since it uses as much as digits as its factorization.

28831565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823771.

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

The square root of 28831565 is about 5369.5032358683. The cubic root of 28831565 is about 306.6357161318.

The spelling of 28831565 in words is "twenty-eight million, eight hundred thirty-one thousand, five hundred sixty-five".