623804991 has 4 divisors (see below), whose sum is σ = 831739992. Its totient is φ = 415869992.

The previous prime is 623804989. The next prime is 623805001. The reversal of 623804991 is 199408326.

623804991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 623804991 - 2¹ = 623804989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623804921) 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, 103967496 + ... + 103967501.

It is an arithmetic number, because the mean of its divisors is an integer number (207934998).

Almost surely, 2^623804991 is an apocalyptic number.

623804991 is a deficient number, since it is larger than the sum of its proper divisors (207935001).

623804991 is a wasteful number, since it uses less digits than its factorization.

623804991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207935000.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 623804991 is about 24976.0883846931. The cubic root of 623804991 is about 854.4427092340.

The spelling of 623804991 in words is "six hundred twenty-three million, eight hundred four thousand, nine hundred ninety-one".