28802681 has 4 divisors (see below), whose sum is σ = 29415552. Its totient is φ = 28189812.

The previous prime is 28802677. The next prime is 28802699. The reversal of 28802681 is 18620882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28802681 - 2² = 28802677 is a prime.

It is a super-2 number, since 2×28802681² = 1659188865575522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28802671) 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, 306365 + ... + 306458.

It is an arithmetic number, because the mean of its divisors is an integer number (7353888).

Almost surely, 2^28802681 is an apocalyptic number.

It is an amenable number.

28802681 is a deficient number, since it is larger than the sum of its proper divisors (612871).

28802681 is an equidigital number, since it uses as much as digits as its factorization.

28802681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612870.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 28802681 is about 5366.8129276136. The cubic root of 28802681 is about 306.5332841234.

The spelling of 28802681 in words is "twenty-eight million, eight hundred two thousand, six hundred eighty-one".