28659399 has 16 divisors (see below), whose sum is σ = 40826592. Its totient is φ = 17819648.

The previous prime is 28659377. The next prime is 28659409. The reversal of 28659399 is 99395682.

It is not a de Polignac number, because 28659399 - 2⁷ = 28659271 is a prime.

It is a super-2 number, since 2×28659399² = 1642722302082402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28659299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3277 + ... + 8249.

It is an arithmetic number, because the mean of its divisors is an integer number (2551662).

Almost surely, 2^28659399 is an apocalyptic number.

28659399 is a deficient number, since it is larger than the sum of its proper divisors (12167193).

28659399 is a wasteful number, since it uses less digits than its factorization.

28659399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106.

The product of its digits is 1049760, while the sum is 51.

The square root of 28659399 is about 5353.4473939696. The cubic root of 28659399 is about 306.0241447905.

It can be divided in two parts, 286 and 59399, that added together give a triangular number (59685 = T₃₄₅).

The spelling of 28659399 in words is "twenty-eight million, six hundred fifty-nine thousand, three hundred ninety-nine".