29891173980 has 48 divisors (see below), whose sum is σ = 87334216704. Its totient is φ = 7624415040.

The previous prime is 29891173969. The next prime is 29891174017. The reversal of 29891173980 is 8937119892.

It is a self number, because there is not a number n which added to its sum of digits gives 29891173980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10828756 + ... + 10831515.

It is an arithmetic number, because the mean of its divisors is an integer number (1819462848).

Almost surely, 2^29891173980 is an apocalyptic number.

29891173980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29891173980 is an abundant number, since it is smaller than the sum of its proper divisors (57443042724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29891173980 is a wasteful number, since it uses less digits than its factorization.

29891173980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21660306 (or 21660304 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 57.

The spelling of 29891173980 in words is "twenty-nine billion, eight hundred ninety-one million, one hundred seventy-three thousand, nine hundred eighty".