28791079 has 2 divisors, whose sum is σ = 28791080. Its totient is φ = 28791078.

The previous prime is 28791073. The next prime is 28791089. The reversal of 28791079 is 97019782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28791079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28791073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14395539 + 14395540.

It is an arithmetic number, because the mean of its divisors is an integer number (14395540).

Almost surely, 2^28791079 is an apocalyptic number.

28791079 is a deficient number, since it is larger than the sum of its proper divisors (1).

28791079 is an equidigital number, since it uses as much as digits as its factorization.

28791079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 28791079 is about 5365.7319165236. The cubic root of 28791079 is about 306.4921203999.

The spelling of 28791079 in words is "twenty-eight million, seven hundred ninety-one thousand, seventy-nine".