28116990 has 64 divisors (see below), whose sum is σ = 81803520. Its totient is φ = 6815520.

The previous prime is 28116989. The next prime is 28117007. The reversal of 28116990 is 9961182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1764 + ... + 7703.

It is an arithmetic number, because the mean of its divisors is an integer number (1278180).

Almost surely, 2^28116990 is an apocalyptic number.

28116990 is an abundant number, since it is smaller than the sum of its proper divisors (53686530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28116990 is a wasteful number, since it uses less digits than its factorization.

28116990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9494 (or 9488 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 28116990 is about 5302.5456150796. The cubic root of 28116990 is about 304.0812268520.

It can be divided in two parts, 2811 and 6990, that added together give a square (9801 = 99²).

The spelling of 28116990 in words is "twenty-eight million, one hundred sixteen thousand, nine hundred ninety".