22648981 has 8 divisors (see below), whose sum is σ = 24033240. Its totient is φ = 21270528.

The previous prime is 22648949. The next prime is 22648999. The reversal of 22648981 is 18984622.

It can be written as a sum of positive squares in 4 ways, for example, as 17514225 + 5134756 = 4185^2 + 2266^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22648981 - 2⁵ = 22648949 is a prime.

It is a super-2 number, since 2×22648981² = 1025952680676722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22648481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8655 + ... + 10963.

It is an arithmetic number, because the mean of its divisors is an integer number (3004155).

Almost surely, 2^22648981 is an apocalyptic number.

It is an amenable number.

22648981 is a deficient number, since it is larger than the sum of its proper divisors (1384259).

22648981 is a wasteful number, since it uses less digits than its factorization.

22648981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903.

The product of its digits is 55296, while the sum is 40.

The square root of 22648981 is about 4759.0945567408. The cubic root of 22648981 is about 282.9325339557.

The spelling of 22648981 in words is "twenty-two million, six hundred forty-eight thousand, nine hundred eighty-one".