16627681 has 4 divisors (see below), whose sum is σ = 19003072. Its totient is φ = 14252292.

The previous prime is 16627661. The next prime is 16627691. The reversal of 16627681 is 18672661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16627681 - 2¹⁷ = 16496609 is a prime.

It is a super-2 number, since 2×16627681² = 552959550875522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16627681.

It is not an unprimeable number, because it can be changed into a prime (16627661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187685 + ... + 1187698.

It is an arithmetic number, because the mean of its divisors is an integer number (4750768).

Almost surely, 2^16627681 is an apocalyptic number.

It is an amenable number.

16627681 is a deficient number, since it is larger than the sum of its proper divisors (2375391).

16627681 is an equidigital number, since it uses as much as digits as its factorization.

16627681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375390.

The product of its digits is 24192, while the sum is 37.

The square root of 16627681 is about 4077.7053596355. The cubic root of 16627681 is about 255.2371547418.

The spelling of 16627681 in words is "sixteen million, six hundred twenty-seven thousand, six hundred eighty-one".