22640857 has 2 divisors, whose sum is σ = 22640858. Its totient is φ = 22640856.

The previous prime is 22640831. The next prime is 22640869. The reversal of 22640857 is 75804622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19324816 + 3316041 = 4396^2 + 1821^2 .

It is a cyclic number.

It is not a de Polignac number, because 22640857 - 2⁷ = 22640729 is a prime.

It is not a weakly prime, because it can be changed into another prime (22640557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11320428 + 11320429.

It is an arithmetic number, because the mean of its divisors is an integer number (11320429).

Almost surely, 2^22640857 is an apocalyptic number.

It is an amenable number.

22640857 is a deficient number, since it is larger than the sum of its proper divisors (1).

22640857 is an equidigital number, since it uses as much as digits as its factorization.

22640857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 22640857 is about 4758.2409564880. The cubic root of 22640857 is about 282.8987013993.

The spelling of 22640857 in words is "twenty-two million, six hundred forty thousand, eight hundred fifty-seven".