28979787437 has 2 divisors, whose sum is σ = 28979787438. Its totient is φ = 28979787436.

The previous prime is 28979787433. The next prime is 28979787439. The reversal of 28979787437 is 73478797982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25478225161 + 3501562276 = 159619^2 + 59174^2 .

It is a cyclic number.

It is not a de Polignac number, because 28979787437 - 2² = 28979787433 is a prime.

Together with 28979787439, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28979787433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14489893718 + 14489893719.

It is an arithmetic number, because the mean of its divisors is an integer number (14489893719).

Almost surely, 2^28979787437 is an apocalyptic number.

It is an amenable number.

28979787437 is a deficient number, since it is larger than the sum of its proper divisors (1).

28979787437 is an equidigital number, since it uses as much as digits as its factorization.

28979787437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 298722816, while the sum is 71.

The spelling of 28979787437 in words is "twenty-eight billion, nine hundred seventy-nine million, seven hundred eighty-seven thousand, four hundred thirty-seven".