28439706 has 16 divisors (see below), whose sum is σ = 57066048. Its totient is φ = 9448800.

The previous prime is 28439669. The next prime is 28439731. The reversal of 28439706 is 60793482.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5755 + ... + 9486.

It is an arithmetic number, because the mean of its divisors is an integer number (3566628).

Almost surely, 2^28439706 is an apocalyptic number.

28439706 is an abundant number, since it is smaller than the sum of its proper divisors (28626342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28439706 is a wasteful number, since it uses less digits than its factorization.

28439706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15557.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 28439706 is about 5332.8890856645. The cubic root of 28439706 is about 305.2401798911.

The spelling of 28439706 in words is "twenty-eight million, four hundred thirty-nine thousand, seven hundred six".