7834678689 has 4 divisors (see below), whose sum is σ = 10446238256. Its totient is φ = 5223119124.

The previous prime is 7834678661. The next prime is 7834678693. The reversal of 7834678689 is 9868764387.

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 not a de Polignac number, because 7834678689 - 2³² = 3539711393 is a prime.

It is a super-2 number, since 2×7834678689² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7834678589) 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, 1305779779 + ... + 1305779784.

It is an arithmetic number, because the mean of its divisors is an integer number (2611559564).

Almost surely, 2^7834678689 is an apocalyptic number.

It is an amenable number.

7834678689 is a deficient number, since it is larger than the sum of its proper divisors (2611559567).

7834678689 is a wasteful number, since it uses less digits than its factorization.

7834678689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611559566.

The product of its digits is 97542144, while the sum is 66.

The square root of 7834678689 is about 88513.7203432327. The cubic root of 7834678689 is about 1986.1272195541.

The spelling of 7834678689 in words is "seven billion, eight hundred thirty-four million, six hundred seventy-eight thousand, six hundred eighty-nine".