29986993640 has 32 divisors (see below), whose sum is σ = 68283643680. Its totient is φ = 11850280512.

The previous prime is 29986993609. The next prime is 29986993661. The reversal of 29986993640 is 4639968992.

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, 4512794 + ... + 4519433.

It is an arithmetic number, because the mean of its divisors is an integer number (2133863865).

Almost surely, 2^29986993640 is an apocalyptic number.

29986993640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29986993640 is an abundant number, since it is smaller than the sum of its proper divisors (38296650040).

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

29986993640 is a wasteful number, since it uses less digits than its factorization.

29986993640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9032321 (or 9032317 counting only the distinct ones).

The product of its (nonzero) digits is 45349632, while the sum is 65.

The spelling of 29986993640 in words is "twenty-nine billion, nine hundred eighty-six million, nine hundred ninety-three thousand, six hundred forty".