28973081 has 4 divisors (see below), whose sum is σ = 30498000. Its totient is φ = 27448164.

The previous prime is 28973069. The next prime is 28973093. The reversal of 28973081 is 18037982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18037982 = 2 ⋅9018991.

It is an interprime number because it is at equal distance from previous prime (28973069) and next prime (28973093).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28973081 is a prime.

It is a super-2 number, since 2×28973081² = 1678878845265122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28973981) by changing a digit.

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, 762431 + ... + 762468.

It is an arithmetic number, because the mean of its divisors is an integer number (7624500).

Almost surely, 2^28973081 is an apocalyptic number.

It is an amenable number.

28973081 is a deficient number, since it is larger than the sum of its proper divisors (1524919).

28973081 is a wasteful number, since it uses less digits than its factorization.

28973081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524918.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28973081 is about 5382.6648604571. The cubic root of 28973081 is about 307.1365914197.

The spelling of 28973081 in words is "twenty-eight million, nine hundred seventy-three thousand, eighty-one".