28072687 has 2 divisors, whose sum is σ = 28072688. Its totient is φ = 28072686.

The previous prime is 28072651. The next prime is 28072691. The reversal of 28072687 is 78627082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28072687 - 2¹⁹ = 27548399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28072637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14036343 + 14036344.

It is an arithmetic number, because the mean of its divisors is an integer number (14036344).

Almost surely, 2^28072687 is an apocalyptic number.

28072687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28072687 is an equidigital number, since it uses as much as digits as its factorization.

28072687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 28072687 is about 5298.3664463682. The cubic root of 28072687 is about 303.9214326916.

The spelling of 28072687 in words is "twenty-eight million, seventy-two thousand, six hundred eighty-seven".