16391648 has 72 divisors (see below), whose sum is σ = 40028688. Its totient is φ = 6469632.

The previous prime is 16391633. The next prime is 16391657. The reversal of 16391648 is 84619361.

It is a super-2 number, since 2×16391648² = 537372248311808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37640 + ... + 38072.

It is an arithmetic number, because the mean of its divisors is an integer number (555954).

Almost surely, 2^16391648 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 16391648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20014344).

16391648 is an abundant number, since it is smaller than the sum of its proper divisors (23637040).

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

16391648 is a wasteful number, since it uses less digits than its factorization.

16391648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 455 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 16391648 is about 4048.6600252429. The cubic root of 16391648 is about 254.0236818393.

It can be divided in two parts, 1639 and 1648, that multiplied together give a palindrome (2701072).

The spelling of 16391648 in words is "sixteen million, three hundred ninety-one thousand, six hundred forty-eight".