28815845 has 8 divisors (see below), whose sum is σ = 34613376. Its totient is φ = 23029776.

The previous prime is 28815823. The next prime is 28815863. The reversal of 28815845 is 54851882.

It is a happy number.

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 28815845 - 2¹² = 28811749 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 7 ways as a sum of consecutive naturals, for example, 4304 + ... + 8726.

It is an arithmetic number, because the mean of its divisors is an integer number (4326672).

Almost surely, 2^28815845 is an apocalyptic number.

It is an amenable number.

28815845 is a deficient number, since it is larger than the sum of its proper divisors (5797531).

28815845 is a wasteful number, since it uses less digits than its factorization.

28815845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731.

The product of its digits is 102400, while the sum is 41.

The square root of 28815845 is about 5368.0392137167. The cubic root of 28815845 is about 306.5799764151.

The spelling of 28815845 in words is "twenty-eight million, eight hundred fifteen thousand, eight hundred forty-five".