28708945 has 16 divisors (see below), whose sum is σ = 37112832. Its totient is φ = 21257280.

The previous prime is 28708931. The next prime is 28708957. The reversal of 28708945 is 54980782.

It is not a de Polignac number, because 28708945 - 2⁵ = 28708913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (2319552).

Almost surely, 2^28708945 is an apocalyptic number.

It is an amenable number.

28708945 is a deficient number, since it is larger than the sum of its proper divisors (8403887).

28708945 is a wasteful number, since it uses less digits than its factorization.

28708945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8112.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28708945 is about 5358.0728811766. The cubic root of 28708945 is about 306.2003934645.

The spelling of 28708945 in words is "twenty-eight million, seven hundred eight thousand, nine hundred forty-five".