29991677947 has 48 divisors (see below), whose sum is σ = 38276761600. Its totient is φ = 22999204800.

The previous prime is 29991677887. The next prime is 29991677951. The reversal of 29991677947 is 74977619992.

It is a de Polignac number, because none of the positive numbers 2^k-29991677947 is a prime.

It is a super-2 number, since 2×29991677947² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (29991677957) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29374297 + ... + 29375317.

Almost surely, 2^29991677947 is an apocalyptic number.

29991677947 is a deficient number, since it is larger than the sum of its proper divisors (8285083653).

29991677947 is a wasteful number, since it uses less digits than its factorization.

29991677947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568 (or 1557 counting only the distinct ones).

The product of its digits is 108020304, while the sum is 70.

The spelling of 29991677947 in words is "twenty-nine billion, nine hundred ninety-one million, six hundred seventy-seven thousand, nine hundred forty-seven".