623985565 has 16 divisors (see below), whose sum is σ = 856477440. Its totient is φ = 427512960.

The previous prime is 623985541. The next prime is 623985641. The reversal of 623985565 is 565589326.

It is not a de Polignac number, because 623985565 - 2⁹ = 623985053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38200 + ... + 52030.

It is an arithmetic number, because the mean of its divisors is an integer number (53529840).

Almost surely, 2^623985565 is an apocalyptic number.

It is an amenable number.

623985565 is a deficient number, since it is larger than the sum of its proper divisors (232491875).

623985565 is a wasteful number, since it uses less digits than its factorization.

623985565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15132.

The product of its digits is 1944000, while the sum is 49.

The square root of 623985565 is about 24979.7030606851. The cubic root of 623985565 is about 854.5251469909.

The spelling of 623985565 in words is "six hundred twenty-three million, nine hundred eighty-five thousand, five hundred sixty-five".