28494709 has 4 divisors (see below), whose sum is σ = 28665504. Its totient is φ = 28323916.

The previous prime is 28494707. The next prime is 28494721. The reversal of 28494709 is 90749482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28494709 - 2¹ = 28494707 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 (28494701) 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, 85147 + ... + 85480.

It is an arithmetic number, because the mean of its divisors is an integer number (7166376).

Almost surely, 2^28494709 is an apocalyptic number.

It is an amenable number.

28494709 is a deficient number, since it is larger than the sum of its proper divisors (170795).

28494709 is a wasteful number, since it uses less digits than its factorization.

28494709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170794.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 28494709 is about 5338.0435554611. The cubic root of 28494709 is about 305.4368335147.

The spelling of 28494709 in words is "twenty-eight million, four hundred ninety-four thousand, seven hundred nine".