28741681 has 8 divisors (see below), whose sum is σ = 29735424. Its totient is φ = 27752160.

The previous prime is 28741649. The next prime is 28741729. The reversal of 28741681 is 18614782.

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 28741681 - 2⁵ = 28741649 is a prime.

It is a super-2 number, since 2×28741681² = 1652168453411522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28741681.

It is not an unprimeable number, because it can be changed into a prime (28741631) 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 7 ways as a sum of consecutive naturals, for example, 19341 + ... + 20773.

It is an arithmetic number, because the mean of its divisors is an integer number (3716928).

Almost surely, 2^28741681 is an apocalyptic number.

28741681 is the 2866-th nonagonal number.

It is an amenable number.

28741681 is a deficient number, since it is larger than the sum of its proper divisors (993743).

28741681 is a wasteful number, since it uses less digits than its factorization.

28741681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111.

The product of its digits is 21504, while the sum is 37.

The square root of 28741681 is about 5361.1268405066. The cubic root of 28741681 is about 306.3167331460.

The spelling of 28741681 in words is "twenty-eight million, seven hundred forty-one thousand, six hundred eighty-one".