673072640 has 80 divisors (see below), whose sum is σ = 1624704048. Its totient is φ = 267411456.

The previous prime is 673072637. The next prime is 673072681. The reversal of 673072640 is 46270376.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 673072640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416474 + ... + 418086.

Almost surely, 2^673072640 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 673072640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812352024).

673072640 is an abundant number, since it is smaller than the sum of its proper divisors (951631408).

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

673072640 is a wasteful number, since it uses less digits than its factorization.

673072640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799 (or 1783 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 673072640 is about 25943.6435374833. The cubic root of 673072640 is about 876.3696166857.

The spelling of 673072640 in words is "six hundred seventy-three million, seventy-two thousand, six hundred forty".