15628649 has 4 divisors (see below), whose sum is σ = 15826560. Its totient is φ = 15430740.

The previous prime is 15628637. The next prime is 15628663. The reversal of 15628649 is 94682651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15628649 - 2⁴ = 15628633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15648649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98837 + ... + 98994.

It is an arithmetic number, because the mean of its divisors is an integer number (3956640).

Almost surely, 2^15628649 is an apocalyptic number.

It is an amenable number.

15628649 is a deficient number, since it is larger than the sum of its proper divisors (197911).

15628649 is an equidigital number, since it uses as much as digits as its factorization.

15628649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197910.

The product of its digits is 103680, while the sum is 41.

The square root of 15628649 is about 3953.3086143128. The cubic root of 15628649 is about 250.0194598186.

The spelling of 15628649 in words is "fifteen million, six hundred twenty-eight thousand, six hundred forty-nine".