28799681 has 2 divisors, whose sum is σ = 28799682. Its totient is φ = 28799680.

The previous prime is 28799669. The next prime is 28799711. The reversal of 28799681 is 18699782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26884225 + 1915456 = 5185^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 28799681 - 2¹⁰ = 28798657 is a prime.

It is a super-2 number, since 2×28799681² = 1658843251403522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28792681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14399840 + 14399841.

It is an arithmetic number, because the mean of its divisors is an integer number (14399841).

Almost surely, 2^28799681 is an apocalyptic number.

It is an amenable number.

28799681 is a deficient number, since it is larger than the sum of its proper divisors (1).

28799681 is an equidigital number, since it uses as much as digits as its factorization.

28799681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 50.

The square root of 28799681 is about 5366.5334248470. The cubic root of 28799681 is about 306.5226412277.

The spelling of 28799681 in words is "twenty-eight million, seven hundred ninety-nine thousand, six hundred eighty-one".