28219687 has 2 divisors, whose sum is σ = 28219688. Its totient is φ = 28219686.

The previous prime is 28219673. The next prime is 28219699. The reversal of 28219687 is 78691282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28219687 - 2⁷ = 28219559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28219187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109843 + 14109844.

It is an arithmetic number, because the mean of its divisors is an integer number (14109844).

Almost surely, 2^28219687 is an apocalyptic number.

28219687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28219687 is an equidigital number, since it uses as much as digits as its factorization.

28219687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 28219687 is about 5312.2205338258. The cubic root of 28219687 is about 304.4509948163.

It can be divided in two parts, 2 and 8219687, that added together give a square (8219689 = 2867²).

The spelling of 28219687 in words is "twenty-eight million, two hundred nineteen thousand, six hundred eighty-seven".