28917679 has 4 divisors (see below), whose sum is σ = 33048784. Its totient is φ = 24786576.

The previous prime is 28917671. The next prime is 28917703. The reversal of 28917679 is 97671982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28917679 - 2³ = 28917671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28917671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065542 + ... + 2065555.

It is an arithmetic number, because the mean of its divisors is an integer number (8262196).

Almost surely, 2^28917679 is an apocalyptic number.

28917679 is a deficient number, since it is larger than the sum of its proper divisors (4131105).

28917679 is an equidigital number, since it uses as much as digits as its factorization.

28917679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131104.

The product of its digits is 381024, while the sum is 49.

The square root of 28917679 is about 5377.5160622726. The cubic root of 28917679 is about 306.9406987922.

The spelling of 28917679 in words is "twenty-eight million, nine hundred seventeen thousand, six hundred seventy-nine".