15220616 has 16 divisors (see below), whose sum is σ = 29310540. Its totient is φ = 7404480.

The previous prime is 15220613. The next prime is 15220631. The reversal of 15220616 is 61602251.

15220616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 14032516 + 1188100 = 3746^2 + 1090^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15220591 and 15220600.

It is not an unprimeable number, because it can be changed into a prime (15220613) 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, 25415 + ... + 26006.

Almost surely, 2^15220616 is an apocalyptic number.

It is an amenable number.

15220616 is a deficient number, since it is larger than the sum of its proper divisors (14089924).

15220616 is a wasteful number, since it uses less digits than its factorization.

15220616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51464 (or 51460 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 15220616 is about 3901.3607882379. The cubic root of 15220616 is about 247.8244074415.

Adding to 15220616 its reverse (61602251), we get a palindrome (76822867).

The spelling of 15220616 in words is "fifteen million, two hundred twenty thousand, six hundred sixteen".