29391861906 has 128 divisors (see below), whose sum is σ = 72798289920. Its totient is φ = 8715369600.

The previous prime is 29391861883. The next prime is 29391861923. The reversal of 29391861906 is 60916819392.

29391861906 is a `hidden beast` number, since 2 + 9 + 3 + 9 + 18 + 619 + 0 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5775295 + ... + 5780381.

It is an arithmetic number, because the mean of its divisors is an integer number (568736640).

Almost surely, 2^29391861906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29391861906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36399144960).

29391861906 is an abundant number, since it is smaller than the sum of its proper divisors (43406428014).

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

29391861906 is a wasteful number, since it uses less digits than its factorization.

29391861906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5317 (or 5311 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 29391861906 in words is "twenty-nine billion, three hundred ninety-one million, eight hundred sixty-one thousand, nine hundred six".