78574579 has 2 divisors, whose sum is σ = 78574580. Its totient is φ = 78574578.

The previous prime is 78574577. The next prime is 78574589. The reversal of 78574579 is 97547587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78574579 - 2¹ = 78574577 is a prime.

Together with 78574577, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78574571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39287289 + 39287290.

It is an arithmetic number, because the mean of its divisors is an integer number (39287290).

Almost surely, 2^78574579 is an apocalyptic number.

78574579 is a deficient number, since it is larger than the sum of its proper divisors (1).

78574579 is an equidigital number, since it uses as much as digits as its factorization.

78574579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2469600, while the sum is 52.

The square root of 78574579 is about 8864.2303106361. The cubic root of 78574579 is about 428.3124392735.

The spelling of 78574579 in words is "seventy-eight million, five hundred seventy-four thousand, five hundred seventy-nine".