16645440 has 112 divisors (see below), whose sum is σ = 60423552. Its totient is φ = 3803136.

The previous prime is 16645427. The next prime is 16645469. The reversal of 16645440 is 4454661.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 16645398 and 16645407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5482 + ... + 7958.

It is an arithmetic number, because the mean of its divisors is an integer number (539496).

Almost surely, 2^16645440 is an apocalyptic number.

16645440 is a gapful number since it is divisible by the number (10) 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 16645440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30211776).

16645440 is an abundant number, since it is smaller than the sum of its proper divisors (43778112).

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

16645440 is a wasteful number, since it uses less digits than its factorization.

16645440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504 (or 2494 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 16645440 is about 4079.8823512449. The cubic root of 16645440 is about 255.3279900957.

The spelling of 16645440 in words is "sixteen million, six hundred forty-five thousand, four hundred forty".