7678478817 has 12 divisors (see below), whose sum is σ = 11103708304. Its totient is φ = 5113183320.

The previous prime is 7678478809. The next prime is 7678478833. The reversal of 7678478817 is 7188748767.

It is not a de Polignac number, because 7678478817 - 2³ = 7678478809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7678478837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475159 + ... + 491052.

Almost surely, 2^7678478817 is an apocalyptic number.

It is an amenable number.

7678478817 is a deficient number, since it is larger than the sum of its proper divisors (3425229487).

7678478817 is a wasteful number, since it uses less digits than its factorization.

7678478817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967100 (or 967097 counting only the distinct ones).

The product of its digits is 29503488, while the sum is 63.

The square root of 7678478817 is about 87626.9297476523. The cubic root of 7678478817 is about 1972.8393883671.

The spelling of 7678478817 in words is "seven billion, six hundred seventy-eight million, four hundred seventy-eight thousand, eight hundred seventeen".