28960981 has 8 divisors (see below), whose sum is σ = 33321600. Its totient is φ = 24656208.

The previous prime is 28960969. The next prime is 28960991. The reversal of 28960981 is 18906982.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28960981 - 2⁷ = 28960853 is a prime.

It is a super-2 number, since 2×28960981² = 1677476840964722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28960931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12841 + ... + 14926.

It is an arithmetic number, because the mean of its divisors is an integer number (4165200).

Almost surely, 2^28960981 is an apocalyptic number.

It is an amenable number.

28960981 is a deficient number, since it is larger than the sum of its proper divisors (4360619).

28960981 is a wasteful number, since it uses less digits than its factorization.

28960981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27923.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 28960981 is about 5381.5407645023. The cubic root of 28960981 is about 307.0938290797.

The spelling of 28960981 in words is "twenty-eight million, nine hundred sixty thousand, nine hundred eighty-one".