28494981 has 12 divisors (see below), whose sum is σ = 41276352. Its totient is φ = 18942696.

The previous prime is 28494971. The next prime is 28494997. The reversal of 28494981 is 18949482.

It is not a de Polignac number, because 28494981 - 2⁹ = 28494469 is a prime.

It is a super-2 number, since 2×28494981² = 1623927884380722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28494931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1011 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (3439696).

Almost surely, 2^28494981 is an apocalyptic number.

It is an amenable number.

28494981 is a deficient number, since it is larger than the sum of its proper divisors (12781371).

28494981 is a wasteful number, since it uses less digits than its factorization.

28494981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000 (or 8997 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 28494981 is about 5338.0690328994. The cubic root of 28494981 is about 305.4378053741.

The spelling of 28494981 in words is "twenty-eight million, four hundred ninety-four thousand, nine hundred eighty-one".