28213687 has 2 divisors, whose sum is σ = 28213688. Its totient is φ = 28213686.

The previous prime is 28213667. The next prime is 28213733. The reversal of 28213687 is 78631282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28213687 - 2²³ = 19825079 is a prime.

It is equal to p_1753876 and since 28213687 and 1753876 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28213667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14106843 + 14106844.

It is an arithmetic number, because the mean of its divisors is an integer number (14106844).

Almost surely, 2^28213687 is an apocalyptic number.

28213687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28213687 is an equidigital number, since it uses as much as digits as its factorization.

28213687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 28213687 is about 5311.6557682139. The cubic root of 28213687 is about 304.4294160812.

It can be divided in two parts, 28213 and 687, that added together give a square (28900 = 170²).

The spelling of 28213687 in words is "twenty-eight million, two hundred thirteen thousand, six hundred eighty-seven".