78755623 has 2 divisors, whose sum is σ = 78755624. Its totient is φ = 78755622.

The previous prime is 78755587. The next prime is 78755639. The reversal of 78755623 is 32655787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78755623 - 2⁹ = 78755111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78755623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78755693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39377811 + 39377812.

It is an arithmetic number, because the mean of its divisors is an integer number (39377812).

Almost surely, 2^78755623 is an apocalyptic number.

78755623 is a deficient number, since it is larger than the sum of its proper divisors (1).

78755623 is an equidigital number, since it uses as much as digits as its factorization.

78755623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 43.

The square root of 78755623 is about 8874.4364891524. The cubic root of 78755623 is about 428.6411457429.

The spelling of 78755623 in words is "seventy-eight million, seven hundred fifty-five thousand, six hundred twenty-three".