15561460 has 48 divisors (see below), whose sum is σ = 35565264. Its totient is φ = 5695488.

The previous prime is 15561457. The next prime is 15561479. The reversal of 15561460 is 6416551.

It can be written as a sum of positive squares in 8 ways, for example, as 2802276 + 12759184 = 1674^2 + 3572^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11962 + ... + 13198.

It is an arithmetic number, because the mean of its divisors is an integer number (740943).

Almost surely, 2^15561460 is an apocalyptic number.

15561460 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 15561460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17782632).

15561460 is an abundant number, since it is smaller than the sum of its proper divisors (20003804).

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

15561460 is a wasteful number, since it uses less digits than its factorization.

15561460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300 (or 1298 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 15561460 is about 3944.8016426685. The cubic root of 15561460 is about 249.6606596008.

The spelling of 15561460 in words is "fifteen million, five hundred sixty-one thousand, four hundred sixty".