28393615 has 16 divisors (see below), whose sum is σ = 36520128. Its totient is φ = 21136896.

The previous prime is 28393601. The next prime is 28393633. The reversal of 28393615 is 51639382.

It is a cyclic number.

It is not a de Polignac number, because 28393615 - 2⁵ = 28393583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (2282508).

Almost surely, 2^28393615 is an apocalyptic number.

28393615 is a deficient number, since it is larger than the sum of its proper divisors (8126513).

28393615 is a wasteful number, since it uses less digits than its factorization.

28393615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6738.

The product of its digits is 38880, while the sum is 37.

The square root of 28393615 is about 5328.5659421649. The cubic root of 28393615 is about 305.0751942166.

The spelling of 28393615 in words is "twenty-eight million, three hundred ninety-three thousand, six hundred fifteen".