78609040387 has 2 divisors, whose sum is σ = 78609040388. Its totient is φ = 78609040386.

The previous prime is 78609040361. The next prime is 78609040409. The reversal of 78609040387 is 78304090687.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78609040387 - 2⁷ = 78609040259 is a prime.

It is not a weakly prime, because it can be changed into another prime (78609040687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39304520193 + 39304520194.

It is an arithmetic number, because the mean of its divisors is an integer number (39304520194).

Almost surely, 2^78609040387 is an apocalyptic number.

78609040387 is a deficient number, since it is larger than the sum of its proper divisors (1).

78609040387 is an equidigital number, since it uses as much as digits as its factorization.

78609040387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 78609040387 in words is "seventy-eight billion, six hundred nine million, forty thousand, three hundred eighty-seven".