22765681 has 4 divisors (see below), whose sum is σ = 23151600. Its totient is φ = 22379764.

The previous prime is 22765679. The next prime is 22765709. The reversal of 22765681 is 18656722.

It is a happy number.

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 22765681 - 2¹ = 22765679 is a prime.

It is a super-2 number, since 2×22765681² = 1036552462787522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22765681.

It is not an unprimeable number, because it can be changed into a prime (22765081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192871 + ... + 192988.

It is an arithmetic number, because the mean of its divisors is an integer number (5787900).

Almost surely, 2^22765681 is an apocalyptic number.

It is an amenable number.

22765681 is a deficient number, since it is larger than the sum of its proper divisors (385919).

22765681 is an equidigital number, since it uses as much as digits as its factorization.

22765681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385918.

The product of its digits is 40320, while the sum is 37.

The square root of 22765681 is about 4771.3395393747. The cubic root of 22765681 is about 283.4176430377.

It can be divided in two parts, 22 and 765681, that added together give a triangular number (765703 = T₁₂₃₇).

The spelling of 22765681 in words is "twenty-two million, seven hundred sixty-five thousand, six hundred eighty-one".