28405668 has 48 divisors (see below), whose sum is σ = 68765760. Its totient is φ = 9120384.

The previous prime is 28405639. The next prime is 28405673. The reversal of 28405668 is 86650482.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37146 + ... + 37902.

It is an arithmetic number, because the mean of its divisors is an integer number (1432620).

Almost surely, 2^28405668 is an apocalyptic number.

It is an amenable number.

28405668 is an abundant number, since it is smaller than the sum of its proper divisors (40360092).

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

28405668 is a wasteful number, since it uses less digits than its factorization.

28405668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 28405668 is about 5329.6968018828. The cubic root of 28405668 is about 305.1183559291.

The spelling of 28405668 in words is "twenty-eight million, four hundred five thousand, six hundred sixty-eight".