623445673 has 2 divisors, whose sum is σ = 623445674. Its totient is φ = 623445672.

The previous prime is 623445611. The next prime is 623445677. The reversal of 623445673 is 376544326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344956329 + 278489344 = 18573^2 + 16688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623445673 is a prime.

It is not a weakly prime, because it can be changed into another prime (623445677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311722836 + 311722837.

It is an arithmetic number, because the mean of its divisors is an integer number (311722837).

Almost surely, 2^623445673 is an apocalyptic number.

It is an amenable number.

623445673 is a deficient number, since it is larger than the sum of its proper divisors (1).

623445673 is an equidigital number, since it uses as much as digits as its factorization.

623445673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 40.

The square root of 623445673 is about 24968.8941084702. The cubic root of 623445673 is about 854.2786218365.

Adding to 623445673 its reverse (376544326), we get a palindrome (999989999).

The spelling of 623445673 in words is "six hundred twenty-three million, four hundred forty-five thousand, six hundred seventy-three".