78297794439 has 4 divisors (see below), whose sum is σ = 104397059256. Its totient is φ = 52198529624.

The previous prime is 78297794437. The next prime is 78297794479. The reversal of 78297794439 is 93449779287.

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

It is a cyclic number.

It is not a de Polignac number, because 78297794439 - 2¹ = 78297794437 is a prime.

It is a super-2 number, since 2×78297794439² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78297794437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13049632404 + ... + 13049632409.

It is an arithmetic number, because the mean of its divisors is an integer number (26099264814).

Almost surely, 2^78297794439 is an apocalyptic number.

78297794439 is a deficient number, since it is larger than the sum of its proper divisors (26099264817).

78297794439 is a wasteful number, since it uses less digits than its factorization.

78297794439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26099264816.

The product of its digits is 192036096, while the sum is 69.

The spelling of 78297794439 in words is "seventy-eight billion, two hundred ninety-seven million, seven hundred ninety-four thousand, four hundred thirty-nine".