28833781 has 2 divisors, whose sum is σ = 28833782. Its totient is φ = 28833780.

The previous prime is 28833769. The next prime is 28833793. The reversal of 28833781 is 18733882.

It is a balanced prime because it is at equal distance from previous prime (28833769) and next prime (28833793).

It can be written as a sum of positive squares in only one way, i.e., 26687556 + 2146225 = 5166^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 28833781 - 2⁷ = 28833653 is a prime.

It is a super-2 number, since 2×28833781² = 1662773853511922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28833281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14416890 + 14416891.

It is an arithmetic number, because the mean of its divisors is an integer number (14416891).

Almost surely, 2^28833781 is an apocalyptic number.

It is an amenable number.

28833781 is a deficient number, since it is larger than the sum of its proper divisors (1).

28833781 is an equidigital number, since it uses as much as digits as its factorization.

28833781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 28833781 is about 5369.7095824635. The cubic root of 28833781 is about 306.6435719586.

The spelling of 28833781 in words is "twenty-eight million, eight hundred thirty-three thousand, seven hundred eighty-one".