78742567 has 2 divisors, whose sum is σ = 78742568. Its totient is φ = 78742566.

The previous prime is 78742553. The next prime is 78742597. The reversal of 78742567 is 76524787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78742567 - 2⁷ = 78742439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78742537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39371283 + 39371284.

It is an arithmetic number, because the mean of its divisors is an integer number (39371284).

Almost surely, 2^78742567 is an apocalyptic number.

78742567 is a deficient number, since it is larger than the sum of its proper divisors (1).

78742567 is an equidigital number, since it uses as much as digits as its factorization.

78742567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658560, while the sum is 46.

The square root of 78742567 is about 8873.7008626615. The cubic root of 78742567 is about 428.6174579186.

The spelling of 78742567 in words is "seventy-eight million, seven hundred forty-two thousand, five hundred sixty-seven".