28741081 has 4 divisors (see below), whose sum is σ = 28853172. Its totient is φ = 28628992.

The previous prime is 28741079. The next prime is 28741087. The reversal of 28741081 is 18014782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 8410000 = 4509^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 28741081 - 2¹ = 28741079 is a prime.

It is a super-2 number, since 2×28741081² = 1652099474097122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28741087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55660 + ... + 56173.

It is an arithmetic number, because the mean of its divisors is an integer number (7213293).

Almost surely, 2^28741081 is an apocalyptic number.

It is an amenable number.

28741081 is a deficient number, since it is larger than the sum of its proper divisors (112091).

28741081 is a wasteful number, since it uses less digits than its factorization.

28741081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112090.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 28741081 is about 5361.0708818295. The cubic root of 28741081 is about 306.3146016154.

The spelling of 28741081 in words is "twenty-eight million, seven hundred forty-one thousand, eighty-one".