15628661 has 8 divisors (see below), whose sum is σ = 17267904. Its totient is φ = 14069440.

The previous prime is 15628637. The next prime is 15628663. The reversal of 15628661 is 16682651.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15628661 - 2¹⁰ = 15627637 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15628663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19595 + ... + 20376.

It is an arithmetic number, because the mean of its divisors is an integer number (2158488).

Almost surely, 2^15628661 is an apocalyptic number.

It is an amenable number.

15628661 is a deficient number, since it is larger than the sum of its proper divisors (1639243).

15628661 is a wasteful number, since it uses less digits than its factorization.

15628661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40011.

The product of its digits is 17280, while the sum is 35.

The square root of 15628661 is about 3953.3101320286. The cubic root of 15628661 is about 250.0195238086.

The spelling of 15628661 in words is "fifteen million, six hundred twenty-eight thousand, six hundred sixty-one".