671779494 has 40 divisors (see below), whose sum is σ = 1516163880. Its totient is φ = 222308064.

The previous prime is 671779477. The next prime is 671779513. The reversal of 671779494 is 494977176.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 671779494.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7602 + ... + 37434.

It is an arithmetic number, because the mean of its divisors is an integer number (37904097).

Almost surely, 2^671779494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671779494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758081940).

671779494 is an abundant number, since it is smaller than the sum of its proper divisors (844384386).

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

671779494 is a wasteful number, since it uses less digits than its factorization.

671779494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29986 (or 29977 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The square root of 671779494 is about 25918.7093428666. The cubic root of 671779494 is about 875.8080129087.

The spelling of 671779494 in words is "six hundred seventy-one million, seven hundred seventy-nine thousand, four hundred ninety-four".