28137706 has 8 divisors (see below), whose sum is σ = 42681060. Its totient is φ = 13910688.

The previous prime is 28137679. The next prime is 28137719. The reversal of 28137706 is 60773182.

It can be written as a sum of positive squares in 2 ways, for example, as 26471025 + 1666681 = 5145^2 + 1291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78861 + ... + 79216.

Almost surely, 2^28137706 is an apocalyptic number.

28137706 is a deficient number, since it is larger than the sum of its proper divisors (14543354).

28137706 is a wasteful number, since it uses less digits than its factorization.

28137706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158168.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 28137706 is about 5304.4986568007. The cubic root of 28137706 is about 304.1558887113.

The spelling of 28137706 in words is "twenty-eight million, one hundred thirty-seven thousand, seven hundred six".