28775491 has 2 divisors, whose sum is σ = 28775492. Its totient is φ = 28775490.

The previous prime is 28775477. The next prime is 28775521. The reversal of 28775491 is 19457782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28775491 - 2⁵ = 28775459 is a prime.

It is not a weakly prime, because it can be changed into another prime (28775401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14387745 + 14387746.

It is an arithmetic number, because the mean of its divisors is an integer number (14387746).

Almost surely, 2^28775491 is an apocalyptic number.

28775491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28775491 is an equidigital number, since it uses as much as digits as its factorization.

28775491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 28775491 is about 5364.2791687234. The cubic root of 28775491 is about 306.4367969939.

The spelling of 28775491 in words is "twenty-eight million, seven hundred seventy-five thousand, four hundred ninety-one".