78470808781 has 4 divisors (see below), whose sum is σ = 78498648000. Its totient is φ = 78442969564.

The previous prime is 78470808769. The next prime is 78470808817. The reversal of 78470808781 is 18780807487.

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 78470808781 - 2⁷ = 78470808653 is a prime.

It is a super-2 number, since 2×78470808781² (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 (78470808701) 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, 13915381 + ... + 13921018.

It is an arithmetic number, because the mean of its divisors is an integer number (19624662000).

Almost surely, 2^78470808781 is an apocalyptic number.

It is an amenable number.

78470808781 is a deficient number, since it is larger than the sum of its proper divisors (27839219).

78470808781 is a wasteful number, since it uses less digits than its factorization.

78470808781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27839218.

The product of its (nonzero) digits is 5619712, while the sum is 58.

The spelling of 78470808781 in words is "seventy-eight billion, four hundred seventy million, eight hundred eight thousand, seven hundred eighty-one".