622688909 has 4 divisors (see below), whose sum is σ = 642775680. Its totient is φ = 602602140.

The previous prime is 622688897. The next prime is 622688917. The reversal of 622688909 is 909886226.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909886226 = 2 ⋅454943113.

It is a cyclic number.

It is not a de Polignac number, because 622688909 - 2⁴ = 622688893 is a prime.

It is a super-2 number, since 2×622688909² = 775482954783220562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622688929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10043339 + ... + 10043400.

It is an arithmetic number, because the mean of its divisors is an integer number (160693920).

Almost surely, 2^622688909 is an apocalyptic number.

It is an amenable number.

622688909 is a deficient number, since it is larger than the sum of its proper divisors (20086771).

622688909 is a wasteful number, since it uses less digits than its factorization.

622688909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20086770.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 622688909 is about 24953.7353716833. The cubic root of 622688909 is about 853.9328290438.

The spelling of 622688909 in words is "six hundred twenty-two million, six hundred eighty-eight thousand, nine hundred nine".