28917399 has 12 divisors (see below), whose sum is σ = 44851704. Its totient is φ = 16524144.

The previous prime is 28917347. The next prime is 28917403. The reversal of 28917399 is 99371982.

It is not a de Polignac number, because 28917399 - 2⁹ = 28916887 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28917299) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98212 + ... + 98505.

It is an arithmetic number, because the mean of its divisors is an integer number (3737642).

Almost surely, 2^28917399 is an apocalyptic number.

28917399 is a deficient number, since it is larger than the sum of its proper divisors (15934305).

28917399 is a wasteful number, since it uses less digits than its factorization.

28917399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196734 (or 196727 counting only the distinct ones).

The product of its digits is 244944, while the sum is 48.

The square root of 28917399 is about 5377.4900278848. The cubic root of 28917399 is about 306.9397081217.

The spelling of 28917399 in words is "twenty-eight million, nine hundred seventeen thousand, three hundred ninety-nine".