28688772 has 48 divisors (see below), whose sum is σ = 79148160. Its totient is φ = 7913472.

The previous prime is 28688761. The next prime is 28688789. The reversal of 28688772 is 27788682.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3453 + ... + 8324.

It is an arithmetic number, because the mean of its divisors is an integer number (1648920).

Almost surely, 2^28688772 is an apocalyptic number.

It is an amenable number.

28688772 is an abundant number, since it is smaller than the sum of its proper divisors (50459388).

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

28688772 is a wasteful number, since it uses less digits than its factorization.

28688772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11820 (or 11818 counting only the distinct ones).

The product of its digits is 602112, while the sum is 48.

The square root of 28688772 is about 5356.1900638420. The cubic root of 28688772 is about 306.1286570783.

The spelling of 28688772 in words is "twenty-eight million, six hundred eighty-eight thousand, seven hundred seventy-two".