15673681 has 9 divisors (see below), whose sum is σ = 16260699. Its totient is φ = 15107544.

The previous prime is 15673667. The next prime is 15673703. The reversal of 15673681 is 18637651.

The square root of 15673681 is 3959.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 1648656 = 3745^2 + 1284^2 .

It is not a de Polignac number, because 15673681 - 2⁹ = 15673169 is a prime.

It is a super-2 number, since 2×15673681² = 491328552179522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

Its product of digits (30240) is a multiple of the sum of its prime divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 15673681.

It is not an unprimeable number, because it can be changed into a prime (15673621) 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 8 ways as a sum of consecutive naturals, for example, 146430 + ... + 146536.

Almost surely, 2^15673681 is an apocalyptic number.

15673681 is the 3959-th square number.

15673681 is the 1980-th centered octagonal number.

It is an amenable number.

15673681 is a deficient number, since it is larger than the sum of its proper divisors (587018).

15673681 is an frugal number, since it uses more digits than its factorization.

15673681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 144 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The cubic root of 15673681 is about 250.2593628306.

It can be divided in two parts, 156 and 73681, that added together give a palindrome (73837).

The spelling of 15673681 in words is "fifteen million, six hundred seventy-three thousand, six hundred eighty-one".