28666969 has 2 divisors, whose sum is σ = 28666970. Its totient is φ = 28666968.

The previous prime is 28666951. The next prime is 28666987. The reversal of 28666969 is 96966682.

It is a balanced prime because it is at equal distance from previous prime (28666951) and next prime (28666987).

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 10004569 = 4320^2 + 3163^2 .

It is a cyclic number.

It is not a de Polignac number, because 28666969 - 2¹⁵ = 28634201 is a prime.

It is a super-2 number, since 2×28666969² = 1643590223293922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28666919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14333484 + 14333485.

It is an arithmetic number, because the mean of its divisors is an integer number (14333485).

Almost surely, 2^28666969 is an apocalyptic number.

It is an amenable number.

28666969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28666969 is an equidigital number, since it uses as much as digits as its factorization.

28666969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 52.

The square root of 28666969 is about 5354.1543683387. The cubic root of 28666969 is about 306.0510864911.

The spelling of 28666969 in words is "twenty-eight million, six hundred sixty-six thousand, nine hundred sixty-nine".