28329705 has 24 divisors (see below), whose sum is σ = 49233600. Its totient is φ = 15069600.

The previous prime is 28329689. The next prime is 28329757. The reversal of 28329705 is 50792382.

It is a happy number.

It is not a de Polignac number, because 28329705 - 2⁴ = 28329689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28329705.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26430 + ... + 27480.

It is an arithmetic number, because the mean of its divisors is an integer number (2051400).

Almost surely, 2^28329705 is an apocalyptic number.

It is an amenable number.

28329705 is a deficient number, since it is larger than the sum of its proper divisors (20903895).

28329705 is a wasteful number, since it uses less digits than its factorization.

28329705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1658 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 28329705 is about 5322.5656407413. The cubic root of 28329705 is about 304.8461286025.

The spelling of 28329705 in words is "twenty-eight million, three hundred twenty-nine thousand, seven hundred five".