28640776 has 32 divisors (see below), whose sum is σ = 56505600. Its totient is φ = 13590720.

The previous prime is 28640753. The next prime is 28640779. The reversal of 28640776 is 67704682.

It is not an unprimeable number, because it can be changed into a prime (28640779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12055 + ... + 14233.

It is an arithmetic number, because the mean of its divisors is an integer number (1765800).

Almost surely, 2^28640776 is an apocalyptic number.

It is an amenable number.

28640776 is a deficient number, since it is larger than the sum of its proper divisors (27864824).

28640776 is a wasteful number, since it uses less digits than its factorization.

28640776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269 (or 2265 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 28640776 is about 5351.7077648168. The cubic root of 28640776 is about 305.9578451620.

The spelling of 28640776 in words is "twenty-eight million, six hundred forty thousand, seven hundred seventy-six".