16081690 has 16 divisors (see below), whose sum is σ = 28994760. Its totient is φ = 6422080.

The previous prime is 16081679. The next prime is 16081693. The reversal of 16081690 is 9618061.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11377129 + 4704561 = 3373^2 + 2169^2 .

It is a super-2 number, since 2×16081690² = 517241506512200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16081693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8556 + ... + 10264.

Almost surely, 2^16081690 is an apocalyptic number.

16081690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16081690 is a deficient number, since it is larger than the sum of its proper divisors (12913070).

16081690 is a wasteful number, since it uses less digits than its factorization.

16081690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 16081690 is about 4010.1982494635. The cubic root of 16081690 is about 252.4123278278.

The spelling of 16081690 in words is "sixteen million, eighty-one thousand, six hundred ninety".