15564340 has 48 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 5617280.

The previous prime is 15564337. The next prime is 15564349. The reversal of 15564340 is 4346551.

It is a junction number, because it is equal to n+sod(n) for n = 15564299 and 15564308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15564349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57726 + ... + 57994.

It is an arithmetic number, because the mean of its divisors is an integer number (748440).

Almost surely, 2^15564340 is an apocalyptic number.

15564340 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 15564340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17962560).

15564340 is an abundant number, since it is smaller than the sum of its proper divisors (20360780).

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

15564340 is a wasteful number, since it uses less digits than its factorization.

15564340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 15564340 is about 3945.1666631462. The cubic root of 15564340 is about 249.6760604339.

The spelling of 15564340 in words is "fifteen million, five hundred sixty-four thousand, three hundred forty".