623620909 has 4 divisors (see below), whose sum is σ = 624861216. Its totient is φ = 622380604.

The previous prime is 623620871. The next prime is 623620913. The reversal of 623620909 is 909026326.

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.

It is a cyclic number.

It is not a de Polignac number, because 623620909 - 2¹¹ = 623618861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623620939) 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, 619399 + ... + 620404.

It is an arithmetic number, because the mean of its divisors is an integer number (156215304).

Almost surely, 2^623620909 is an apocalyptic number.

It is an amenable number.

623620909 is a deficient number, since it is larger than the sum of its proper divisors (1240307).

623620909 is a wasteful number, since it uses less digits than its factorization.

623620909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240306.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 623620909 is about 24972.4029480545. The cubic root of 623620909 is about 854.3586535867.

The spelling of 623620909 in words is "six hundred twenty-three million, six hundred twenty thousand, nine hundred nine".