22727781 has 12 divisors (see below), whose sum is σ = 34557120. Its totient is φ = 14354280.

The previous prime is 22727777. The next prime is 22727797. The reversal of 22727781 is 18772722.

It is not a de Polignac number, because 22727781 - 2² = 22727777 is a prime.

It is a super-2 number, since 2×22727781² = 1033104058367922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22727701) 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 11 ways as a sum of consecutive naturals, for example, 66285 + ... + 66626.

It is an arithmetic number, because the mean of its divisors is an integer number (2879760).

Almost surely, 2^22727781 is an apocalyptic number.

It is an amenable number.

22727781 is a deficient number, since it is larger than the sum of its proper divisors (11829339).

22727781 is a wasteful number, since it uses less digits than its factorization.

22727781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132936 (or 132933 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 22727781 is about 4767.3662540233. The cubic root of 22727781 is about 283.2602790508.

The spelling of 22727781 in words is "twenty-two million, seven hundred twenty-seven thousand, seven hundred eighty-one".