28939697 has 2 divisors, whose sum is σ = 28939698. Its totient is φ = 28939696.

The previous prime is 28939637. The next prime is 28939711. The reversal of 28939697 is 79693982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21077281 + 7862416 = 4591^2 + 2804^2 .

It is a cyclic number.

It is not a de Polignac number, because 28939697 - 2⁶ = 28939633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28939607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14469848 + 14469849.

It is an arithmetic number, because the mean of its divisors is an integer number (14469849).

Almost surely, 2^28939697 is an apocalyptic number.

It is an amenable number.

28939697 is a deficient number, since it is larger than the sum of its proper divisors (1).

28939697 is an equidigital number, since it uses as much as digits as its factorization.

28939697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 53.

The square root of 28939697 is about 5379.5629004595. The cubic root of 28939697 is about 307.0185808586.

The spelling of 28939697 in words is "twenty-eight million, nine hundred thirty-nine thousand, six hundred ninety-seven".