28622787 has 16 divisors (see below), whose sum is σ = 40186368. Its totient is φ = 18085760.

The previous prime is 28622779. The next prime is 28622813. The reversal of 28622787 is 78722682.

It is a cyclic number.

It is not a de Polignac number, because 28622787 - 2³ = 28622779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28622287) 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, 5962 + ... + 9632.

It is an arithmetic number, because the mean of its divisors is an integer number (2511648).

Almost surely, 2^28622787 is an apocalyptic number.

28622787 is a deficient number, since it is larger than the sum of its proper divisors (11563581).

28622787 is a wasteful number, since it uses less digits than its factorization.

28622787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810.

The product of its digits is 150528, while the sum is 42.

The square root of 28622787 is about 5350.0268223627. The cubic root of 28622787 is about 305.8937753385.

The spelling of 28622787 in words is "twenty-eight million, six hundred twenty-two thousand, seven hundred eighty-seven".