78292645349 has 4 divisors (see below), whose sum is σ = 78634534860. Its totient is φ = 77950755840.

The previous prime is 78292645337. The next prime is 78292645373. The reversal of 78292645349 is 94354629287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63412305124 + 14880340225 = 251818^2 + 121985^2 .

It is a cyclic number.

It is not a de Polignac number, because 78292645349 - 2¹² = 78292641253 is a prime.

It is a super-2 number, since 2×78292645349² (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 (78292645309) 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, 170944412 + ... + 170944869.

It is an arithmetic number, because the mean of its divisors is an integer number (19658633715).

Almost surely, 2^78292645349 is an apocalyptic number.

It is an amenable number.

78292645349 is a deficient number, since it is larger than the sum of its proper divisors (341889511).

78292645349 is a wasteful number, since it uses less digits than its factorization.

78292645349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341889510.

The product of its digits is 26127360, while the sum is 59.

The spelling of 78292645349 in words is "seventy-eight billion, two hundred ninety-two million, six hundred forty-five thousand, three hundred forty-nine".