15225616 has 40 divisors (see below), whose sum is σ = 34233920. Its totient is φ = 6424704.

The previous prime is 15225607. The next prime is 15225629. The reversal of 15225616 is 61652251.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6490 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (855848).

Almost surely, 2^15225616 is an apocalyptic number.

15225616 is a gapful number since it is divisible by the number (16) 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 15225616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17116960).

15225616 is an abundant number, since it is smaller than the sum of its proper divisors (19008304).

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

15225616 is a wasteful number, since it uses less digits than its factorization.

15225616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111 (or 2105 counting only the distinct ones).

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

The square root of 15225616 is about 3902.0015376727. The cubic root of 15225616 is about 247.8515413932.

Adding to 15225616 its reverse (61652251), we get a palindrome (76877867).

The spelling of 15225616 in words is "fifteen million, two hundred twenty-five thousand, six hundred sixteen".