27978510407 has 2 divisors, whose sum is σ = 27978510408. Its totient is φ = 27978510406.

The previous prime is 27978510397. The next prime is 27978510431. The reversal of 27978510407 is 70401587972.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27978510407 - 2³⁴ = 10798641223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27978510487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13989255203 + 13989255204.

It is an arithmetic number, because the mean of its divisors is an integer number (13989255204).

Almost surely, 2^27978510407 is an apocalyptic number.

27978510407 is a deficient number, since it is larger than the sum of its proper divisors (1).

27978510407 is an equidigital number, since it uses as much as digits as its factorization.

27978510407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 987840, while the sum is 50.

The spelling of 27978510407 in words is "twenty-seven billion, nine hundred seventy-eight million, five hundred ten thousand, four hundred seven".