29991678790 has 16 divisors (see below), whose sum is σ = 56826339120. Its totient is φ = 11365267680.

The previous prime is 29991678679. The next prime is 29991678833. The reversal of 29991678790 is 9787619992.

29991678790 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78925281 + ... + 78925660.

It is an arithmetic number, because the mean of its divisors is an integer number (3551646195).

Almost surely, 2^29991678790 is an apocalyptic number.

29991678790 is a deficient number, since it is larger than the sum of its proper divisors (26834660330).

29991678790 is a wasteful number, since it uses less digits than its factorization.

29991678790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157850967.

The product of its (nonzero) digits is 30862944, while the sum is 67.

The spelling of 29991678790 in words is "twenty-nine billion, nine hundred ninety-one million, six hundred seventy-eight thousand, seven hundred ninety".