28660946 has 8 divisors (see below), whose sum is σ = 45520380. Its totient is φ = 13487488.

The previous prime is 28660909. The next prime is 28660991. The reversal of 28660946 is 64906682.

It can be written as a sum of positive squares in 2 ways, for example, as 28504921 + 156025 = 5339^2 + 395^2 .

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

It is a super-2 number, since 2×28660946² = 1642899651229832, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421451 + ... + 421518.

Almost surely, 2^28660946 is an apocalyptic number.

28660946 is a deficient number, since it is larger than the sum of its proper divisors (16859434).

28660946 is a wasteful number, since it uses less digits than its factorization.

28660946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842988.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 28660946 is about 5353.5918783561. The cubic root of 28660946 is about 306.0296509636.

The spelling of 28660946 in words is "twenty-eight million, six hundred sixty thousand, nine hundred forty-six".