623985635 has 16 divisors (see below), whose sum is σ = 921579456. Its totient is φ = 394962048.

The previous prime is 623985541. The next prime is 623985641. The reversal of 623985635 is 536589326.

It is not a de Polignac number, because 623985635 - 2¹⁰ = 623984611 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 623985635.

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, 685244 + ... + 686153.

It is an arithmetic number, because the mean of its divisors is an integer number (57598716).

Almost surely, 2^623985635 is an apocalyptic number.

623985635 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

623985635 is a deficient number, since it is larger than the sum of its proper divisors (297593821).

623985635 is a wasteful number, since it uses less digits than its factorization.

623985635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371422.

The product of its digits is 1166400, while the sum is 47.

The square root of 623985635 is about 24979.7044618226. The cubic root of 623985635 is about 854.5251789450.

The spelling of 623985635 in words is "six hundred twenty-three million, nine hundred eighty-five thousand, six hundred thirty-five".