28727787 has 16 divisors (see below), whose sum is σ = 41880960. Its totient is φ = 17371200.

The previous prime is 28727779. The next prime is 28727801. The reversal of 28727787 is 78772782.

It is not a de Polignac number, because 28727787 - 2³ = 28727779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28727747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21087 + ... + 22407.

It is an arithmetic number, because the mean of its divisors is an integer number (2617560).

Almost surely, 2^28727787 is an apocalyptic number.

28727787 is a deficient number, since it is larger than the sum of its proper divisors (13153173).

28727787 is a wasteful number, since it uses less digits than its factorization.

28727787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994.

The product of its digits is 614656, while the sum is 48.

The square root of 28727787 is about 5359.8308741974. The cubic root of 28727787 is about 306.2673663899.

The spelling of 28727787 in words is "twenty-eight million, seven hundred twenty-seven thousand, seven hundred eighty-seven".