16445690 has 16 divisors (see below), whose sum is σ = 30889728. Its totient is φ = 6292176.

The previous prime is 16445677. The next prime is 16445699. The reversal of 16445690 is 9654461.

It is a super-2 number, since 2×16445690² = 540921439152200, which contains 22 as substring.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 16445690.

It is not an unprimeable number, because it can be changed into a prime (16445699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35522 + ... + 35981.

It is an arithmetic number, because the mean of its divisors is an integer number (1930608).

Almost surely, 2^16445690 is an apocalyptic number.

16445690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16445690 is a deficient number, since it is larger than the sum of its proper divisors (14444038).

16445690 is a wasteful number, since it uses less digits than its factorization.

16445690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71533.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 16445690 is about 4055.3285933448. The cubic root of 16445690 is about 254.3025411040.

It can be divided in two parts, 164 and 45690, that added together give a palindrome (45854).

The spelling of 16445690 in words is "sixteen million, four hundred forty-five thousand, six hundred ninety".