28645688 has 16 divisors (see below), whose sum is σ = 53954880. Its totient is φ = 14257728.

The previous prime is 28645681. The next prime is 28645691. The reversal of 28645688 is 88654682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6245 + ... + 9812.

It is an arithmetic number, because the mean of its divisors is an integer number (3372180).

Almost surely, 2^28645688 is an apocalyptic number.

It is an amenable number.

28645688 is a deficient number, since it is larger than the sum of its proper divisors (25309192).

28645688 is a wasteful number, since it uses less digits than its factorization.

28645688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16286 (or 16282 counting only the distinct ones).

The product of its digits is 737280, while the sum is 47.

The square root of 28645688 is about 5352.1666640717. The cubic root of 28645688 is about 305.9753351330.

The spelling of 28645688 in words is "twenty-eight million, six hundred forty-five thousand, six hundred eighty-eight".