29987791946 has 24 divisors (see below), whose sum is σ = 52492865220. Its totient is φ = 12810837312.

The previous prime is 29987791901. The next prime is 29987791949. The reversal of 29987791946 is 64919778992.

It can be written as a sum of positive squares in 2 ways, for example, as 25819669225 + 4168122721 = 160685^2 + 64561^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 29987791946.

It is not an unprimeable number, because it can be changed into a prime (29987791949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 458141 + ... + 519488.

Almost surely, 2^29987791946 is an apocalyptic number.

29987791946 is a deficient number, since it is larger than the sum of its proper divisors (22505073274).

29987791946 is a wasteful number, since it uses less digits than its factorization.

29987791946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977958 (or 977951 counting only the distinct ones).

The product of its digits is 123451776, while the sum is 71.

The spelling of 29987791946 in words is "twenty-nine billion, nine hundred eighty-seven million, seven hundred ninety-one thousand, nine hundred forty-six".