28615859 has 4 divisors (see below), whose sum is σ = 28805520. Its totient is φ = 28426200.

The previous prime is 28615823. The next prime is 28615861. The reversal of 28615859 is 95851682.

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

It is a cyclic number.

It is not a de Polignac number, because 28615859 - 2¹² = 28611763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28615819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94604 + ... + 94905.

It is an arithmetic number, because the mean of its divisors is an integer number (7201380).

Almost surely, 2^28615859 is an apocalyptic number.

28615859 is a deficient number, since it is larger than the sum of its proper divisors (189661).

28615859 is a wasteful number, since it uses less digits than its factorization.

28615859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189660.

The product of its digits is 172800, while the sum is 44.

The square root of 28615859 is about 5349.3793097891. The cubic root of 28615859 is about 305.8690933362.

The spelling of 28615859 in words is "twenty-eight million, six hundred fifteen thousand, eight hundred fifty-nine".