28740981 has 8 divisors (see below), whose sum is σ = 38520640. Its totient is φ = 19060992.

The previous prime is 28740979. The next prime is 28741039. The reversal of 28740981 is 18904782.

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

It is not a de Polignac number, because 28740981 - 2¹ = 28740979 is a prime.

It is a super-2 number, since 2×28740981² = 1652087977684722, 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 (28740281) 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, 24241 + ... + 25398.

It is an arithmetic number, because the mean of its divisors is an integer number (4815080).

Almost surely, 2^28740981 is an apocalyptic number.

It is an amenable number.

28740981 is a deficient number, since it is larger than the sum of its proper divisors (9779659).

28740981 is a wasteful number, since it uses less digits than its factorization.

28740981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49835.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 28740981 is about 5361.0615553265. The cubic root of 28740981 is about 306.3142463574.

The spelling of 28740981 in words is "twenty-eight million, seven hundred forty thousand, nine hundred eighty-one".