22776561 has 12 divisors (see below), whose sum is σ = 33160192. Its totient is φ = 15064056.

The previous prime is 22776553. The next prime is 22776563. The reversal of 22776561 is 16567722.

22776561 is a `hidden beast` number, since 2 + 27 + 76 + 561 = 666.

It is not a de Polignac number, because 22776561 - 2³ = 22776553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22776563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8821 + ... + 11106.

Almost surely, 2^22776561 is an apocalyptic number.

It is an amenable number.

22776561 is a deficient number, since it is larger than the sum of its proper divisors (10383631).

22776561 is a wasteful number, since it uses less digits than its factorization.

22776561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20060 (or 20057 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 22776561 is about 4772.4795442202. The cubic root of 22776561 is about 283.4627854439.

The spelling of 22776561 in words is "twenty-two million, seven hundred seventy-six thousand, five hundred sixty-one".