28807081 has 2 divisors, whose sum is σ = 28807082. Its totient is φ = 28807080.

The previous prime is 28807073. The next prime is 28807139. The reversal of 28807081 is 18070882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27405225 + 1401856 = 5235^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 28807081 - 2³ = 28807073 is a prime.

It is a super-2 number, since 2×28807081² = 1659695831481122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28807001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14403540 + 14403541.

It is an arithmetic number, because the mean of its divisors is an integer number (14403541).

Almost surely, 2^28807081 is an apocalyptic number.

It is an amenable number.

28807081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28807081 is an equidigital number, since it uses as much as digits as its factorization.

28807081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 28807081 is about 5367.2228386755. Note that the first 3 decimals coincide. The cubic root of 28807081 is about 306.5488923669.

The spelling of 28807081 in words is "twenty-eight million, eight hundred seven thousand, eighty-one".