22627681 has 4 divisors (see below), whose sum is σ = 22647492. Its totient is φ = 22607872.

The previous prime is 22627673. The next prime is 22627691. The reversal of 22627681 is 18672622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18672622 = 2 ⋅9336311.

It can be written as a sum of positive squares in 2 ways, for example, as 10342656 + 12285025 = 3216^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 22627681 - 2³ = 22627673 is a prime.

It is a super-2 number, since 2×22627681² = 1024023894875522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22627601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8080 + ... + 10513.

It is an arithmetic number, because the mean of its divisors is an integer number (5661873).

Almost surely, 2^22627681 is an apocalyptic number.

22627681 is the 3009-th centered pentagonal number.

It is an amenable number.

22627681 is a deficient number, since it is larger than the sum of its proper divisors (19811).

22627681 is a wasteful number, since it uses less digits than its factorization.

22627681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19810.

The product of its digits is 16128, while the sum is 34.

The square root of 22627681 is about 4756.8562097251. The cubic root of 22627681 is about 282.8438124788.

The spelling of 22627681 in words is "twenty-two million, six hundred twenty-seven thousand, six hundred eighty-one".