28979861 has 2 divisors, whose sum is σ = 28979862. Its totient is φ = 28979860.

The previous prime is 28979851. The next prime is 28979897. The reversal of 28979861 is 16897982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26977636 + 2002225 = 5194^2 + 1415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28979861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28979801) 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, 14489930 + 14489931.

It is an arithmetic number, because the mean of its divisors is an integer number (14489931).

Almost surely, 2^28979861 is an apocalyptic number.

It is an amenable number.

28979861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28979861 is an equidigital number, since it uses as much as digits as its factorization.

28979861 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28979861 is about 5383.2946231838. The cubic root of 28979861 is about 307.1605472620.

The spelling of 28979861 in words is "twenty-eight million, nine hundred seventy-nine thousand, eight hundred sixty-one".