671623623 has 32 divisors (see below), whose sum is σ = 1087948800. Its totient is φ = 406108800.

The previous prime is 671623619. The next prime is 671623643. The reversal of 671623623 is 326326176.

671623623 is a `hidden beast` number, since 6 + 7 + 1 + 6 + 23 + 623 = 666.

It is not a de Polignac number, because 671623623 - 2² = 671623619 is a prime.

It is a super-2 number, since 2×671623623² = 902156581943292258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671623613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139903 + ... + 144623.

It is an arithmetic number, because the mean of its divisors is an integer number (33998400).

Almost surely, 2^671623623 is an apocalyptic number.

671623623 is a deficient number, since it is larger than the sum of its proper divisors (416325177).

671623623 is a wasteful number, since it uses less digits than its factorization.

671623623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220 (or 5214 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 671623623 is about 25915.7022478651. The cubic root of 671623623 is about 875.7402706254.

Adding to 671623623 its reverse (326326176), we get a palindrome (997949799).

The spelling of 671623623 in words is "six hundred seventy-one million, six hundred twenty-three thousand, six hundred twenty-three".