28878651 has 24 divisors (see below), whose sum is σ = 44138640. Its totient is φ = 18144000.

The previous prime is 28878643. The next prime is 28878653. The reversal of 28878651 is 15687882.

It is not a de Polignac number, because 28878651 - 2³ = 28878643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28878597 and 28878606.

It is not an unprimeable number, because it can be changed into a prime (28878653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47751 + ... + 48351.

It is an arithmetic number, because the mean of its divisors is an integer number (1839110).

Almost surely, 2^28878651 is an apocalyptic number.

28878651 is a deficient number, since it is larger than the sum of its proper divisors (15259989).

28878651 is a wasteful number, since it uses less digits than its factorization.

28878651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 904 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28878651 is about 5373.8860240984. The cubic root of 28878651 is about 306.8025517575.

The spelling of 28878651 in words is "twenty-eight million, eight hundred seventy-eight thousand, six hundred fifty-one".