7827997279 has 2 divisors, whose sum is σ = 7827997280. Its totient is φ = 7827997278.

The previous prime is 7827997277. The next prime is 7827997297. The reversal of 7827997279 is 9727997287.

Together with next prime (7827997297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (9727997287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7827997279 - 2¹ = 7827997277 is a prime.

It is a super-2 number, since 2×7827997279² (a number of 21 digits) contains 22 as substring.

Together with 7827997277, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7827997273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3913998639 + 3913998640.

It is an arithmetic number, because the mean of its divisors is an integer number (3913998640).

Almost surely, 2^7827997279 is an apocalyptic number.

7827997279 is a deficient number, since it is larger than the sum of its proper divisors (1).

7827997279 is an equidigital number, since it uses as much as digits as its factorization.

7827997279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56010528, while the sum is 67.

The square root of 7827997279 is about 88475.9700653234. The cubic root of 7827997279 is about 1985.5624695567.

The spelling of 7827997279 in words is "seven billion, eight hundred twenty-seven million, nine hundred ninety-seven thousand, two hundred seventy-nine".