28870649 has 2 divisors, whose sum is σ = 28870650. Its totient is φ = 28870648.

The previous prime is 28870627. The next prime is 28870661. The reversal of 28870649 is 94607882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28815424 + 55225 = 5368^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 28870649 - 2¹² = 28866553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28870669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435324 + 14435325.

It is an arithmetic number, because the mean of its divisors is an integer number (14435325).

Almost surely, 2^28870649 is an apocalyptic number.

It is an amenable number.

28870649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28870649 is an equidigital number, since it uses as much as digits as its factorization.

28870649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28870649 is about 5373.1414461188. The cubic root of 28870649 is about 306.7742117817.

The spelling of 28870649 in words is "twenty-eight million, eight hundred seventy thousand, six hundred forty-nine".