28456668 has 36 divisors (see below), whose sum is σ = 72104760. Its totient is φ = 9462816.

The previous prime is 28456651. The next prime is 28456717. The reversal of 28456668 is 86665482.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21646 + ... + 22922.

It is an arithmetic number, because the mean of its divisors is an integer number (2002910).

Almost surely, 2^28456668 is an apocalyptic number.

It is an amenable number.

28456668 is an abundant number, since it is smaller than the sum of its proper divisors (43648092).

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

28456668 is a wasteful number, since it uses less digits than its factorization.

28456668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1901 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 28456668 is about 5334.4791685787. The cubic root of 28456668 is about 305.3008515796.

The spelling of 28456668 in words is "twenty-eight million, four hundred fifty-six thousand, six hundred sixty-eight".