15680340 has 72 divisors (see below), whose sum is σ = 51230088. Its totient is φ = 3859200.

The previous prime is 15680333. The next prime is 15680347. The reversal of 15680340 is 4308651.

It is an interprime number because it is at equal distance from previous prime (15680333) and next prime (15680347).

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 15586704 = 306^2 + 3948^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15680347) 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 23 ways as a sum of consecutive naturals, for example, 1011 + ... + 5690.

It is an arithmetic number, because the mean of its divisors is an integer number (711529).

Almost surely, 2^15680340 is an apocalyptic number.

15680340 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 15680340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25615044).

15680340 is an abundant number, since it is smaller than the sum of its proper divisors (35549748).

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

15680340 is a wasteful number, since it uses less digits than its factorization.

15680340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6729 (or 6724 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 15680340 is about 3959.8409058951. The cubic root of 15680340 is about 250.2947989045.

Adding to 15680340 its reverse (4308651), we get a palindrome (19988991).

The spelling of 15680340 in words is "fifteen million, six hundred eighty thousand, three hundred forty".