78427913 has 4 divisors (see below), whose sum is σ = 80096640. Its totient is φ = 76759188.

The previous prime is 78427903. The next prime is 78427931. The reversal of 78427913 is 31972487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78427913 - 2⁶ = 78427849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78427903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834293 + ... + 834386.

It is an arithmetic number, because the mean of its divisors is an integer number (20024160).

Almost surely, 2^78427913 is an apocalyptic number.

It is an amenable number.

78427913 is a deficient number, since it is larger than the sum of its proper divisors (1668727).

78427913 is a wasteful number, since it uses less digits than its factorization.

78427913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668726.

The product of its digits is 84672, while the sum is 41.

The square root of 78427913 is about 8855.9535342051. The cubic root of 78427913 is about 428.0457796695.

The spelling of 78427913 in words is "seventy-eight million, four hundred twenty-seven thousand, nine hundred thirteen".