16240644 has 108 divisors (see below), whose sum is σ = 50063104. Its totient is φ = 4347648.

The previous prime is 16240643. The next prime is 16240657. The reversal of 16240644 is 44604261.

16240644 is a `hidden beast` number, since 16 + 2 + 4 + 0 + 644 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16240643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 72717 + ... + 72939.

Almost surely, 2^16240644 is an apocalyptic number.

16240644 is a gapful number since it is divisible by the number (14) 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 16240644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25031552).

16240644 is an abundant number, since it is smaller than the sum of its proper divisors (33822460).

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

16240644 is a wasteful number, since it uses less digits than its factorization.

16240644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 16240644 is about 4029.9682380882. The cubic root of 16240644 is about 253.2412307541.

The spelling of 16240644 in words is "sixteen million, two hundred forty thousand, six hundred forty-four".