622638893 has 2 divisors, whose sum is σ = 622638894. Its totient is φ = 622638892.

The previous prime is 622638881. The next prime is 622638941. The reversal of 622638893 is 398836226.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405901609 + 216737284 = 20147^2 + 14722^2 .

It is a cyclic number.

It is not a de Polignac number, because 622638893 - 2⁸ = 622638637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (622638803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311319446 + 311319447.

It is an arithmetic number, because the mean of its divisors is an integer number (311319447).

Almost surely, 2^622638893 is an apocalyptic number.

It is an amenable number.

622638893 is a deficient number, since it is larger than the sum of its proper divisors (1).

622638893 is an equidigital number, since it uses as much as digits as its factorization.

622638893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 47.

The square root of 622638893 is about 24952.7331769488. The cubic root of 622638893 is about 853.9099650597.

The spelling of 622638893 in words is "six hundred twenty-two million, six hundred thirty-eight thousand, eight hundred ninety-three".