28687712 has 12 divisors (see below), whose sum is σ = 56478996. Its totient is φ = 14343840.

The previous prime is 28687697. The next prime is 28687717. The reversal of 28687712 is 21778682.

It is a self number, because there is not a number n which added to its sum of digits gives 28687712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448214 + ... + 448277.

It is an arithmetic number, because the mean of its divisors is an integer number (4706583).

Almost surely, 2^28687712 is an apocalyptic number.

It is an amenable number.

28687712 is a deficient number, since it is larger than the sum of its proper divisors (27791284).

28687712 is an equidigital number, since it uses as much as digits as its factorization.

28687712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896501 (or 896493 counting only the distinct ones).

The product of its digits is 75264, while the sum is 41.

The square root of 28687712 is about 5356.0911119958. The cubic root of 28687712 is about 306.1248867255.

The spelling of 28687712 in words is "twenty-eight million, six hundred eighty-seven thousand, seven hundred twelve".