78426013 has 4 divisors (see below), whose sum is σ = 78448608. Its totient is φ = 78403420.

The previous prime is 78426011. The next prime is 78426037. The reversal of 78426013 is 31062487.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31062487 = 937 ⋅33151.

It is a cyclic number.

It is not a de Polignac number, because 78426013 - 2¹ = 78426011 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78426011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4873 + ... + 13438.

It is an arithmetic number, because the mean of its divisors is an integer number (19612152).

Almost surely, 2^78426013 is an apocalyptic number.

It is an amenable number.

78426013 is a deficient number, since it is larger than the sum of its proper divisors (22595).

78426013 is a wasteful number, since it uses less digits than its factorization.

78426013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22594.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 78426013 is about 8855.8462610865. The cubic root of 78426013 is about 428.0423230194.

The spelling of 78426013 in words is "seventy-eight million, four hundred twenty-six thousand, thirteen".