623765641 has 4 divisors (see below), whose sum is σ = 634338000. Its totient is φ = 613193284.

The previous prime is 623765621. The next prime is 623765657. The reversal of 623765641 is 146567326.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 623765641 - 2⁵ = 623765609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 623765594 and 623765603.

It is not an unprimeable number, because it can be changed into a prime (623765621) 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, 5286091 + ... + 5286208.

It is an arithmetic number, because the mean of its divisors is an integer number (158584500).

Almost surely, 2^623765641 is an apocalyptic number.

It is an amenable number.

623765641 is a deficient number, since it is larger than the sum of its proper divisors (10572359).

623765641 is a wasteful number, since it uses less digits than its factorization.

623765641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10572358.

The product of its digits is 181440, while the sum is 40.

The square root of 623765641 is about 24975.3006188114. The cubic root of 623765641 is about 854.4247426001.

The spelling of 623765641 in words is "six hundred twenty-three million, seven hundred sixty-five thousand, six hundred forty-one".