13072640 has 72 divisors (see below), whose sum is σ = 35810880. Its totient is φ = 4478976.

The previous prime is 13072639. The next prime is 13072651. The reversal of 13072640 is 4627031.

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, 8231 + ... + 9689.

Almost surely, 2^13072640 is an apocalyptic number.

13072640 is a gapful number since it is divisible by the number (10) 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 13072640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17905440).

13072640 is an abundant number, since it is smaller than the sum of its proper divisors (22738240).

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

13072640 is an equidigital number, since it uses as much as digits as its factorization.

13072640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487 (or 1473 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 13072640 is about 3615.6105985020. The cubic root of 13072640 is about 235.5706067410.

Adding to 13072640 its reverse (4627031), we get a palindrome (17699671).

The spelling of 13072640 in words is "thirteen million, seventy-two thousand, six hundred forty".