28986787 has 2 divisors, whose sum is σ = 28986788. Its totient is φ = 28986786.

The previous prime is 28986781. The next prime is 28986809. The reversal of 28986787 is 78768982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28986787 - 2¹⁵ = 28954019 is a prime.

It is not a weakly prime, because it can be changed into another prime (28986781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14493393 + 14493394.

It is an arithmetic number, because the mean of its divisors is an integer number (14493394).

Almost surely, 2^28986787 is an apocalyptic number.

28986787 is a deficient number, since it is larger than the sum of its proper divisors (1).

28986787 is an equidigital number, since it uses as much as digits as its factorization.

28986787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 55.

The square root of 28986787 is about 5383.9378711126. The cubic root of 28986787 is about 307.1850151099.

The spelling of 28986787 in words is "twenty-eight million, nine hundred eighty-six thousand, seven hundred eighty-seven".