78340778371 has 4 divisors (see below), whose sum is σ = 79116429744. Its totient is φ = 77565127000.

The previous prime is 78340778323. The next prime is 78340778387. The reversal of 78340778371 is 17387704387.

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 78340778371 - 2²⁷ = 78206560643 is a prime.

It is a super-2 number, since 2×78340778371² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78340778171) 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, 387825535 + ... + 387825736.

It is an arithmetic number, because the mean of its divisors is an integer number (19779107436).

Almost surely, 2^78340778371 is an apocalyptic number.

78340778371 is a deficient number, since it is larger than the sum of its proper divisors (775651373).

78340778371 is a wasteful number, since it uses less digits than its factorization.

78340778371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775651372.

The product of its (nonzero) digits is 5531904, while the sum is 55.

The spelling of 78340778371 in words is "seventy-eight billion, three hundred forty million, seven hundred seventy-eight thousand, three hundred seventy-one".