28781741 has 4 divisors (see below), whose sum is σ = 28835484. Its totient is φ = 28728000.

The previous prime is 28781737. The next prime is 28781759. The reversal of 28781741 is 14718782.

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 17255716 + 11526025 = 4154^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 28781741 - 2² = 28781737 is a prime.

It is a super-2 number, since 2×28781741² = 1656777229982162, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28781695 and 28781704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781761) 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, 26060 + ... + 27141.

It is an arithmetic number, because the mean of its divisors is an integer number (7208871).

Almost surely, 2^28781741 is an apocalyptic number.

It is an amenable number.

28781741 is a deficient number, since it is larger than the sum of its proper divisors (53743).

28781741 is an equidigital number, since it uses as much as digits as its factorization.

28781741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53742.

The product of its digits is 25088, while the sum is 38.

The square root of 28781741 is about 5364.8616943962. The cubic root of 28781741 is about 306.4589812819.

It can be divided in two parts, 287 and 81741, that added together give a palindrome (82028).

The spelling of 28781741 in words is "twenty-eight million, seven hundred eighty-one thousand, seven hundred forty-one".