78785713 has 2 divisors, whose sum is σ = 78785714. Its totient is φ = 78785712.

The previous prime is 78785711. The next prime is 78785731. The reversal of 78785713 is 31758787.

It is a happy number.

Together with next prime (78785731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49322529 + 29463184 = 7023^2 + 5428^2 .

It is a cyclic number.

It is not a de Polignac number, because 78785713 - 2¹ = 78785711 is a prime.

It is a super-3 number, since 3×78785713³ (a number of 25 digits) contains 333 as substring.

Together with 78785711, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78785711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39392856 + 39392857.

It is an arithmetic number, because the mean of its divisors is an integer number (39392857).

Almost surely, 2^78785713 is an apocalyptic number.

It is an amenable number.

78785713 is a deficient number, since it is larger than the sum of its proper divisors (1).

78785713 is an equidigital number, since it uses as much as digits as its factorization.

78785713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 46.

The square root of 78785713 is about 8876.1316461621. The cubic root of 78785713 is about 428.6957288077.

The spelling of 78785713 in words is "seventy-eight million, seven hundred eighty-five thousand, seven hundred thirteen".