28649688 has 16 divisors (see below), whose sum is σ = 71624280. Its totient is φ = 9549888.

The previous prime is 28649659. The next prime is 28649689. The reversal of 28649688 is 88694682.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28649688.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28649689) 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, 596845 + ... + 596892.

Almost surely, 2^28649688 is an apocalyptic number.

It is an amenable number.

28649688 is an abundant number, since it is smaller than the sum of its proper divisors (42974592).

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

28649688 is a wasteful number, since it uses less digits than its factorization.

28649688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193746 (or 1193742 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The square root of 28649688 is about 5352.5403314688. The cubic root of 28649688 is about 305.9895763035.

The spelling of 28649688 in words is "twenty-eight million, six hundred forty-nine thousand, six hundred eighty-eight".