16091644 has 6 divisors (see below), whose sum is σ = 28160384. Its totient is φ = 8045820.

The previous prime is 16091641. The next prime is 16091659. The reversal of 16091644 is 44619061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16091641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2011452 + ... + 2011459.

Almost surely, 2^16091644 is an apocalyptic number.

It is an amenable number.

16091644 is a deficient number, since it is larger than the sum of its proper divisors (12068740).

16091644 is a wasteful number, since it uses less digits than its factorization.

16091644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022915 (or 4022913 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 16091644 is about 4011.4391432502. The cubic root of 16091644 is about 252.4643952018.

The spelling of 16091644 in words is "sixteen million, ninety-one thousand, six hundred forty-four".