28137986 has 8 divisors (see below), whose sum is σ = 42230160. Its totient is φ = 14061268.

The previous prime is 28137971. The next prime is 28138021. The reversal of 28137986 is 68973182.

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

It is a super-2 number, since 2×28137986² = 1583492512272392, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3485 + ... + 8271.

It is an arithmetic number, because the mean of its divisors is an integer number (5278770).

Almost surely, 2^28137986 is an apocalyptic number.

28137986 is a deficient number, since it is larger than the sum of its proper divisors (14092174).

28137986 is a wasteful number, since it uses less digits than its factorization.

28137986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7728.

The product of its digits is 145152, while the sum is 44.

The square root of 28137986 is about 5304.5250494271. The cubic root of 28137986 is about 304.1568975991.

The spelling of 28137986 in words is "twenty-eight million, one hundred thirty-seven thousand, nine hundred eighty-six".