28813768 has 16 divisors (see below), whose sum is σ = 55045980. Its totient is φ = 14134848.

The previous prime is 28813751. The next prime is 28813781. The reversal of 28813768 is 86731882.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27857284 + 956484 = 5278^2 + 978^2 .

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, 33555 + ... + 34402.

Almost surely, 2^28813768 is an apocalyptic number.

It is an amenable number.

28813768 is a deficient number, since it is larger than the sum of its proper divisors (26232212).

28813768 is a wasteful number, since it uses less digits than its factorization.

28813768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68016 (or 68012 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 28813768 is about 5367.8457503919. The cubic root of 28813768 is about 306.5726103068.

The spelling of 28813768 in words is "twenty-eight million, eight hundred thirteen thousand, seven hundred sixty-eight".