28507867 has 2 divisors, whose sum is σ = 28507868. Its totient is φ = 28507866.

The previous prime is 28507811. The next prime is 28507889. The reversal of 28507867 is 76870582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28507867 - 2¹⁵ = 28475099 is a prime.

It is not a weakly prime, because it can be changed into another prime (28507267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14253933 + 14253934.

It is an arithmetic number, because the mean of its divisors is an integer number (14253934).

Almost surely, 2^28507867 is an apocalyptic number.

28507867 is a deficient number, since it is larger than the sum of its proper divisors (1).

28507867 is an equidigital number, since it uses as much as digits as its factorization.

28507867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 28507867 is about 5339.2758872341. The cubic root of 28507867 is about 305.4838401292.

The spelling of 28507867 in words is "twenty-eight million, five hundred seven thousand, eight hundred sixty-seven".