28628081 has 2 divisors, whose sum is σ = 28628082. Its totient is φ = 28628080.

The previous prime is 28628069. The next prime is 28628107. The reversal of 28628081 is 18082682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17505856 + 11122225 = 4184^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 28628081 - 2¹⁰ = 28627057 is a prime.

It is a super-2 number, since 2×28628081² = 1639134043485122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28628021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14314040 + 14314041.

It is an arithmetic number, because the mean of its divisors is an integer number (14314041).

Almost surely, 2^28628081 is an apocalyptic number.

It is an amenable number.

28628081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28628081 is an equidigital number, since it uses as much as digits as its factorization.

28628081 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28628081 is about 5350.5215633618. The cubic root of 28628081 is about 305.9126332950.

The spelling of 28628081 in words is "twenty-eight million, six hundred twenty-eight thousand, eighty-one".