15515648 has 30 divisors (see below), whose sum is σ = 31063116. Its totient is φ = 7749632.

The previous prime is 15515629. The next prime is 15515741. The reversal of 15515648 is 84651551.

It is a happy number.

It is a super-3 number, since 3×15515648³ (a number of 23 digits) contains 333 as substring.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15911 + ... + 16857.

Almost surely, 2^15515648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15515648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15531558).

15515648 is an abundant number, since it is smaller than the sum of its proper divisors (15547468).

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

15515648 is an frugal number, since it uses more digits than its factorization.

15515648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 949 counting only the distinct ones).

The product of its digits is 24000, while the sum is 35.

The square root of 15515648 is about 3938.9907336779. The cubic root of 15515648 is about 249.4154234799.

The spelling of 15515648 in words is "fifteen million, five hundred fifteen thousand, six hundred forty-eight".