28403668 has 24 divisors (see below), whose sum is σ = 52920000. Its totient is φ = 13292928.

The previous prime is 28403647. The next prime is 28403671. The reversal of 28403668 is 86630482.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12483 + ... + 14581.

It is an arithmetic number, because the mean of its divisors is an integer number (2205000).

Almost surely, 2^28403668 is an apocalyptic number.

It is an amenable number.

28403668 is a deficient number, since it is larger than the sum of its proper divisors (24516332).

28403668 is a wasteful number, since it uses less digits than its factorization.

28403668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2317 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 28403668 is about 5329.5091706460. The cubic root of 28403668 is about 305.1111947875. Note that the first 4 decimals are identical.

The spelling of 28403668 in words is "twenty-eight million, four hundred three thousand, six hundred sixty-eight".