678130891 has 4 divisors (see below), whose sum is σ = 678436272. Its totient is φ = 677825512.

The previous prime is 678130877. The next prime is 678130897. The reversal of 678130891 is 198031876.

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 678130891 - 2²¹ = 676033739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678130897) 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, 149335 + ... + 153808.

It is an arithmetic number, because the mean of its divisors is an integer number (169609068).

Almost surely, 2^678130891 is an apocalyptic number.

678130891 is a deficient number, since it is larger than the sum of its proper divisors (305381).

678130891 is a wasteful number, since it uses less digits than its factorization.

678130891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305380.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 678130891 is about 26040.9464305735. The cubic root of 678130891 is about 878.5594937307.

The spelling of 678130891 in words is "six hundred seventy-eight million, one hundred thirty thousand, eight hundred ninety-one".