78394603687 has 12 divisors (see below), whose sum is σ = 82749944736. Its totient is φ = 74257666560.

The previous prime is 78394603681. The next prime is 78394603691. The reversal of 78394603687 is 78630649387.

It is not a de Polignac number, because 78394603687 - 2⁷ = 78394603559 is a prime.

It is a super-2 number, since 2×78394603687² (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 (78394603681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3547362 + ... + 3569392.

It is an arithmetic number, because the mean of its divisors is an integer number (6895828728).

Almost surely, 2^78394603687 is an apocalyptic number.

78394603687 is a deficient number, since it is larger than the sum of its proper divisors (4355341049).

78394603687 is a wasteful number, since it uses less digits than its factorization.

78394603687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31926 (or 31907 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 61.

The spelling of 78394603687 in words is "seventy-eight billion, three hundred ninety-four million, six hundred three thousand, six hundred eighty-seven".