674721738648 has 160 divisors (see below), whose sum is σ = 1929213158400. Its totient is φ = 220251310272.

The previous prime is 674721738539. The next prime is 674721738673. The reversal of 674721738648 is 846837127476.

674721738648 is a `hidden beast` number, since 67 + 472 + 17 + 38 + 64 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10021465 + ... + 10088567.

It is an arithmetic number, because the mean of its divisors is an integer number (12057582240).

Almost surely, 2^674721738648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 674721738648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964606579200).

674721738648 is an abundant number, since it is smaller than the sum of its proper divisors (1254491419752).

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

674721738648 is a wasteful number, since it uses less digits than its factorization.

674721738648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67443 (or 67430 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 63.

The spelling of 674721738648 in words is "six hundred seventy-four billion, seven hundred twenty-one million, seven hundred thirty-eight thousand, six hundred forty-eight".