29991679623 has 32 divisors (see below), whose sum is σ = 44900889600.
Its totient is φ = 19783764000.
The previous prime is 29991679573. The next prime is 29991679631. The reversal of 29991679623 is 32697619992.
It is not a de Polignac number, because 29991679623 - 210 = 29991678599 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (29991679673) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6299718 + ... + 6304476.
It is an arithmetic number, because the mean of its divisors is an integer number (1403152800).
Almost surely, 229991679623 is an apocalyptic number.
29991679623 is a deficient number, since it is larger than the sum of its proper divisors (14909209977).
29991679623 is a wasteful number, since it uses less digits than its factorization.
29991679623 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7180 (or 7174 counting only the distinct ones).
The product of its digits is 19840464, while the sum is 63.
The spelling of 29991679623 in words is "twenty-nine billion, nine hundred ninety-one million, six hundred seventy-nine thousand, six hundred twenty-three".