78331728413 has 4 divisors (see below), whose sum is σ = 78812291328. Its totient is φ = 77851165500.

The previous prime is 78331728341. The next prime is 78331728421. The reversal of 78331728413 is 31482713387.

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 78331728413 - 2¹⁴ = 78331712029 is a prime.

It is a super-2 number, since 2×78331728413² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78331728443) 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, 240281213 + ... + 240281538.

It is an arithmetic number, because the mean of its divisors is an integer number (19703072832).

Almost surely, 2^78331728413 is an apocalyptic number.

It is an amenable number.

78331728413 is a deficient number, since it is larger than the sum of its proper divisors (480562915).

78331728413 is a wasteful number, since it uses less digits than its factorization.

78331728413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480562914.

The product of its digits is 677376, while the sum is 47.

The spelling of 78331728413 in words is "seventy-eight billion, three hundred thirty-one million, seven hundred twenty-eight thousand, four hundred thirteen".