78722407 has 2 divisors, whose sum is σ = 78722408. Its totient is φ = 78722406.

The previous prime is 78722401. The next prime is 78722417. The reversal of 78722407 is 70422787.

It is a weak prime.

It is an emirp because it is prime and its reverse (70422787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78722407 - 2⁷ = 78722279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78722401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39361203 + 39361204.

It is an arithmetic number, because the mean of its divisors is an integer number (39361204).

Almost surely, 2^78722407 is an apocalyptic number.

78722407 is a deficient number, since it is larger than the sum of its proper divisors (1).

78722407 is an equidigital number, since it uses as much as digits as its factorization.

78722407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43904, while the sum is 37.

The square root of 78722407 is about 8872.5648490163. The cubic root of 78722407 is about 428.5808759875.

The spelling of 78722407 in words is "seventy-eight million, seven hundred twenty-two thousand, four hundred seven".