671678514 has 64 divisors (see below), whose sum is σ = 1610743680. Its totient is φ = 206245440.

The previous prime is 671678507. The next prime is 671678549. The reversal of 671678514 is 415876176.

671678514 is a `hidden beast` number, since 6 + 71 + 67 + 8 + 514 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 671678514.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 615109 + ... + 616199.

It is an arithmetic number, because the mean of its divisors is an integer number (25167870).

Almost surely, 2^671678514 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671678514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (805371840).

671678514 is an abundant number, since it is smaller than the sum of its proper divisors (939065166).

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

671678514 is a wasteful number, since it uses less digits than its factorization.

671678514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992 (or 1986 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 671678514 is about 25916.7612559903. The cubic root of 671678514 is about 875.7641277125.

The spelling of 671678514 in words is "six hundred seventy-one million, six hundred seventy-eight thousand, five hundred fourteen".