16644390 has 32 divisors (see below), whose sum is σ = 45653760. Its totient is φ = 3804384.

The previous prime is 16644373. The next prime is 16644391. The reversal of 16644390 is 9344661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16644391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39420 + ... + 39839.

It is an arithmetic number, because the mean of its divisors is an integer number (1426680).

Almost surely, 2^16644390 is an apocalyptic number.

16644390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16644390 is an abundant number, since it is smaller than the sum of its proper divisors (29009370).

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

16644390 is a wasteful number, since it uses less digits than its factorization.

16644390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79276.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 16644390 is about 4079.7536690344. The cubic root of 16644390 is about 255.3226212574.

The spelling of 16644390 in words is "sixteen million, six hundred forty-four thousand, three hundred ninety".