22780657 has 2 divisors, whose sum is σ = 22780658. Its totient is φ = 22780656.

The previous prime is 22780627. The next prime is 22780661. The reversal of 22780657 is 75608722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 2359296 = 4519^2 + 1536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22780657 is a prime.

It is not a weakly prime, because it can be changed into another prime (22780607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11390328 + 11390329.

It is an arithmetic number, because the mean of its divisors is an integer number (11390329).

Almost surely, 2^22780657 is an apocalyptic number.

It is an amenable number.

22780657 is a deficient number, since it is larger than the sum of its proper divisors (1).

22780657 is an equidigital number, since it uses as much as digits as its factorization.

22780657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 22780657 is about 4772.9086519648. The cubic root of 22780657 is about 283.4797765073.

The spelling of 22780657 in words is "twenty-two million, seven hundred eighty thousand, six hundred fifty-seven".