28904193 has 12 divisors (see below), whose sum is σ = 42002688. Its totient is φ = 19153080.

The previous prime is 28904189. The next prime is 28904203. The reversal of 28904193 is 39140982.

It is not a de Polignac number, because 28904193 - 2² = 28904189 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28904173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8113 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (3500224).

Almost surely, 2^28904193 is an apocalyptic number.

It is an amenable number.

28904193 is a deficient number, since it is larger than the sum of its proper divisors (13098495).

28904193 is a wasteful number, since it uses less digits than its factorization.

28904193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19404 (or 19401 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28904193 is about 5376.2619913840. The cubic root of 28904193 is about 306.8929765907.

The spelling of 28904193 in words is "twenty-eight million, nine hundred four thousand, one hundred ninety-three".