673993656 has 128 divisors (see below), whose sum is σ = 2232806400. Its totient is φ = 184187520.

The previous prime is 673993651. The next prime is 673993657. The reversal of 673993656 is 656399376.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673993651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25086 + ... + 44466.

It is an arithmetic number, because the mean of its divisors is an integer number (17443800).

Almost surely, 2^673993656 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 673993656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1116403200).

673993656 is an abundant number, since it is smaller than the sum of its proper divisors (1558812744).

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

673993656 is a wasteful number, since it uses less digits than its factorization.

673993656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19426 (or 19416 counting only the distinct ones).

The product of its digits is 5511240, while the sum is 54.

The square root of 673993656 is about 25961.3877903320. The cubic root of 673993656 is about 876.7691686850.

The spelling of 673993656 in words is "six hundred seventy-three million, nine hundred ninety-three thousand, six hundred fifty-six".