6723640 has 128 divisors (see below), whose sum is σ = 19699200. Its totient is φ = 2004480.

The previous prime is 6723637. The next prime is 6723641. The reversal of 6723640 is 463276.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an Ulam number.

It is a d-powerful number, because it can be written as 6 + 7⁸ + 2¹⁷ + 3¹² + 6⁷ + 4⁷ + 0 .

It is a junction number, because it is equal to n+sod(n) for n = 6723599 and 6723608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6723641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113931 + ... + 113989.

It is an arithmetic number, because the mean of its divisors is an integer number (153900).

Almost surely, 2^6723640 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 6723640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9849600).

6723640 is an abundant number, since it is smaller than the sum of its proper divisors (12975560).

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

6723640 is a wasteful number, since it uses less digits than its factorization.

6723640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 6723640 is about 2592.9982645578. The cubic root of 6723640 is about 188.7418252969.

It can be divided in two parts, 67236 and 40, that added together give a palindrome (67276).

The spelling of 6723640 in words is "six million, seven hundred twenty-three thousand, six hundred forty".