12778713 has 18 divisors (see below), whose sum is σ = 19611774. Its totient is φ = 8018016.

The previous prime is 12778693. The next prime is 12778729. The reversal of 12778713 is 31787721.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 1468944 + 11309769 = 1212^2 + 3363^2 .

It is not a de Polignac number, because 12778713 - 2⁵ = 12778681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12778813) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 751681 + ... + 751697.

It is an arithmetic number, because the mean of its divisors is an integer number (1089543).

Almost surely, 2^12778713 is an apocalyptic number.

It is an amenable number.

12778713 is a deficient number, since it is larger than the sum of its proper divisors (6833061).

12778713 is an frugal number, since it uses more digits than its factorization.

12778713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 20 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 12778713 is about 3574.7325774105. The cubic root of 12778713 is about 233.7916730109.

The spelling of 12778713 in words is "twelve million, seven hundred seventy-eight thousand, seven hundred thirteen".