28936987 has 2 divisors, whose sum is σ = 28936988. Its totient is φ = 28936986.

The previous prime is 28936951. The next prime is 28936991. The reversal of 28936987 is 78963982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28936987 - 2¹⁵ = 28904219 is a prime.

It is not a weakly prime, because it can be changed into another prime (28936087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14468493 + 14468494.

It is an arithmetic number, because the mean of its divisors is an integer number (14468494).

Almost surely, 2^28936987 is an apocalyptic number.

28936987 is a deficient number, since it is larger than the sum of its proper divisors (1).

28936987 is an equidigital number, since it uses as much as digits as its factorization.

28936987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 28936987 is about 5379.3110153625. The cubic root of 28936987 is about 307.0089971793.

The spelling of 28936987 in words is "twenty-eight million, nine hundred thirty-six thousand, nine hundred eighty-seven".