623128994 has 8 divisors (see below), whose sum is σ = 943948188. Its totient is φ = 308479600.

The previous prime is 623128993. The next prime is 623129009. The reversal of 623128994 is 499821326.

It can be written as a sum of positive squares in 2 ways, for example, as 404532769 + 218596225 = 20113^2 + 14785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (623128991) 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 3 ways as a sum of consecutive naturals, for example, 1542197 + ... + 1542600.

Almost surely, 2^623128994 is an apocalyptic number.

623128994 is a deficient number, since it is larger than the sum of its proper divisors (320819194).

623128994 is a wasteful number, since it uses less digits than its factorization.

623128994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3084900.

The product of its digits is 186624, while the sum is 44.

The square root of 623128994 is about 24962.5518326953. The cubic root of 623128994 is about 854.1339538353.

The spelling of 623128994 in words is "six hundred twenty-three million, one hundred twenty-eight thousand, nine hundred ninety-four".