28223687 has 2 divisors, whose sum is σ = 28223688. Its totient is φ = 28223686.

The previous prime is 28223659. The next prime is 28223717. The reversal of 28223687 is 78632282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28223687 - 2⁶ = 28223623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28223687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28223617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111843 + 14111844.

It is an arithmetic number, because the mean of its divisors is an integer number (14111844).

Almost surely, 2^28223687 is an apocalyptic number.

28223687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28223687 is an equidigital number, since it uses as much as digits as its factorization.

28223687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 38.

The square root of 28223687 is about 5312.5970108790. The cubic root of 28223687 is about 304.4653789404.

The spelling of 28223687 in words is "twenty-eight million, two hundred twenty-three thousand, six hundred eighty-seven".