623305505 has 4 divisors (see below), whose sum is σ = 747966612. Its totient is φ = 498644400.

The previous prime is 623305481. The next prime is 623305531. The reversal of 623305505 is 505503326.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 363741184 + 259564321 = 19072^2 + 16111^2 .

It is not a de Polignac number, because 623305505 - 2¹² = 623301409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62330546 + ... + 62330555.

It is an arithmetic number, because the mean of its divisors is an integer number (186991653).

Almost surely, 2^623305505 is an apocalyptic number.

It is an amenable number.

623305505 is a deficient number, since it is larger than the sum of its proper divisors (124661107).

623305505 is a wasteful number, since it uses less digits than its factorization.

623305505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124661106.

The product of its (nonzero) digits is 13500, while the sum is 29.

The square root of 623305505 is about 24966.0870983020. The cubic root of 623305505 is about 854.2145951400.

The spelling of 623305505 in words is "six hundred twenty-three million, three hundred five thousand, five hundred five".