28137946 has 8 divisors (see below), whose sum is σ = 43662420. Its totient is φ = 13583808.

The previous prime is 28137943. The next prime is 28137971. The reversal of 28137946 is 64973182.

It can be written as a sum of positive squares in 2 ways, for example, as 24393721 + 3744225 = 4939^2 + 1935^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28137899 and 28137908.

It is not an unprimeable number, because it can be changed into a prime (28137943) 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, 242511 + ... + 242626.

Almost surely, 2^28137946 is an apocalyptic number.

28137946 is a deficient number, since it is larger than the sum of its proper divisors (15524474).

28137946 is a wasteful number, since it uses less digits than its factorization.

28137946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485168.

The product of its digits is 72576, while the sum is 40.

The square root of 28137946 is about 5304.5212790600. The cubic root of 28137946 is about 304.1567534727.

The spelling of 28137946 in words is "twenty-eight million, one hundred thirty-seven thousand, nine hundred forty-six".