623767643 has 4 divisors (see below), whose sum is σ = 628255320. Its totient is φ = 619279968.

The previous prime is 623767631. The next prime is 623767649. The reversal of 623767643 is 346767326.

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 623767643 - 2⁶ = 623767579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 623767594 and 623767603.

It is not an unprimeable number, because it can be changed into a prime (623767649) 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, 2243630 + ... + 2243907.

It is an arithmetic number, because the mean of its divisors is an integer number (157063830).

Almost surely, 2^623767643 is an apocalyptic number.

623767643 is a deficient number, since it is larger than the sum of its proper divisors (4487677).

623767643 is a wasteful number, since it uses less digits than its factorization.

623767643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487676.

The product of its digits is 762048, while the sum is 44.

The square root of 623767643 is about 24975.3406983769. The cubic root of 623767643 is about 854.4256567023.

The spelling of 623767643 in words is "six hundred twenty-three million, seven hundred sixty-seven thousand, six hundred forty-three".