28406688 has 24 divisors (see below), whose sum is σ = 74567808. Its totient is φ = 9468864.

The previous prime is 28406647. The next prime is 28406699. The reversal of 28406688 is 88660482.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147856 + ... + 148047.

It is an arithmetic number, because the mean of its divisors is an integer number (3106992).

Almost surely, 2^28406688 is an apocalyptic number.

It is an amenable number.

28406688 is an abundant number, since it is smaller than the sum of its proper divisors (46161120).

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

28406688 is a wasteful number, since it uses less digits than its factorization.

28406688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295916 (or 295908 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 28406688 is about 5329.7924912702. The cubic root of 28406688 is about 305.1220079819.

The spelling of 28406688 in words is "twenty-eight million, four hundred six thousand, six hundred eighty-eight".