673721964720 has 800 divisors, whose sum is σ = 2722948005888. Its totient is φ = 151214708736.

The previous prime is 673721964683. The next prime is 673721964749. The reversal of 673721964720 is 27469127376.

673721964720 is a `hidden beast` number, since 67 + 3 + 7 + 21 + 96 + 472 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 616396494 + ... + 616397586.

Almost surely, 2^673721964720 is an apocalyptic number.

673721964720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 673721964720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361474002944).

673721964720 is an abundant number, since it is smaller than the sum of its proper divisors (2049226041168).

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

673721964720 is a wasteful number, since it uses less digits than its factorization.

673721964720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359 (or 1344 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 54.

The spelling of 673721964720 in words is "six hundred seventy-three billion, seven hundred twenty-one million, nine hundred sixty-four thousand, seven hundred twenty".