28085638 has 16 divisors (see below), whose sum is σ = 48220704. Its totient is φ = 12018240.

The previous prime is 28085633. The next prime is 28085653. The reversal of 28085638 is 83658082.

It is a self number, because there is not a number n which added to its sum of digits gives 28085638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28085633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12048 + ... + 14188.

It is an arithmetic number, because the mean of its divisors is an integer number (3013794).

Almost surely, 2^28085638 is an apocalyptic number.

28085638 is a deficient number, since it is larger than the sum of its proper divisors (20135066).

28085638 is a wasteful number, since it uses less digits than its factorization.

28085638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28085638 is about 5299.5884745893. The cubic root of 28085638 is about 303.9681623514.

The spelling of 28085638 in words is "twenty-eight million, eighty-five thousand, six hundred thirty-eight".