78287914681 has 4 divisors (see below), whose sum is σ = 78658947664. Its totient is φ = 77916881700.

The previous prime is 78287914669. The next prime is 78287914687. The reversal of 78287914681 is 18641978287.

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 78287914681 - 2²⁷ = 78153696953 is a prime.

It is a super-4 number, since 4×78287914681⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78287914687) 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, 185516175 + ... + 185516596.

It is an arithmetic number, because the mean of its divisors is an integer number (19664736916).

Almost surely, 2^78287914681 is an apocalyptic number.

It is an amenable number.

78287914681 is a deficient number, since it is larger than the sum of its proper divisors (371032983).

78287914681 is a wasteful number, since it uses less digits than its factorization.

78287914681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371032982.

The product of its digits is 10838016, while the sum is 61.

The spelling of 78287914681 in words is "seventy-eight billion, two hundred eighty-seven million, nine hundred fourteen thousand, six hundred eighty-one".