671647878 has 24 divisors (see below), whose sum is σ = 1587531816. Its totient is φ = 203529600.

The previous prime is 671647877. The next prime is 671647901. The reversal of 671647878 is 878746176.

It is a super-2 number, since 2×671647878² = 902221744043805768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671647877) 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, 1695883 + ... + 1696278.

It is an arithmetic number, because the mean of its divisors is an integer number (66147159).

Almost surely, 2^671647878 is an apocalyptic number.

671647878 is an abundant number, since it is smaller than the sum of its proper divisors (915883938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671647878 is a wasteful number, since it uses less digits than its factorization.

671647878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392180 (or 3392177 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 671647878 is about 25916.1702031762. The cubic root of 671647878 is about 875.7508126531.

The spelling of 671647878 in words is "six hundred seventy-one million, six hundred forty-seven thousand, eight hundred seventy-eight".