78257623 has 2 divisors, whose sum is σ = 78257624. Its totient is φ = 78257622.

The previous prime is 78257587. The next prime is 78257687. The reversal of 78257623 is 32675287.

It is a weak prime.

It is an emirp because it is prime and its reverse (32675287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78257623 - 2⁹ = 78257111 is a prime.

It is a super-2 number, since 2×78257623² = 12248511115220258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78257323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39128811 + 39128812.

It is an arithmetic number, because the mean of its divisors is an integer number (39128812).

Almost surely, 2^78257623 is an apocalyptic number.

78257623 is a deficient number, since it is larger than the sum of its proper divisors (1).

78257623 is an equidigital number, since it uses as much as digits as its factorization.

78257623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 40.

The square root of 78257623 is about 8846.3338734190. Note that the first 3 decimals coincide. The cubic root of 78257623 is about 427.7357508658.

The spelling of 78257623 in words is "seventy-eight million, two hundred fifty-seven thousand, six hundred twenty-three".