28794907217 has 2 divisors, whose sum is σ = 28794907218. Its totient is φ = 28794907216.

The previous prime is 28794907171. The next prime is 28794907259. The reversal of 28794907217 is 71270949782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26422827601 + 2372079616 = 162551^2 + 48704^2 .

It is a cyclic number.

It is not a de Polignac number, because 28794907217 - 2²² = 28790712913 is a prime.

It is not a weakly prime, because it can be changed into another prime (28794907277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14397453608 + 14397453609.

It is an arithmetic number, because the mean of its divisors is an integer number (14397453609).

Almost surely, 2^28794907217 is an apocalyptic number.

It is an amenable number.

28794907217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28794907217 is an equidigital number, since it uses as much as digits as its factorization.

28794907217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 28794907217 in words is "twenty-eight billion, seven hundred ninety-four million, nine hundred seven thousand, two hundred seventeen".