29987129797 has 8 divisors (see below), whose sum is σ = 30141228416. Its totient is φ = 29833417152.

The previous prime is 29987129761. The next prime is 29987129857. The reversal of 29987129797 is 79792178992.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29987129797 is a prime.

It is a super-2 number, since 2×29987129797² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29987129707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59938 + ... + 252124.

It is an arithmetic number, because the mean of its divisors is an integer number (3767653552).

Almost surely, 2^29987129797 is an apocalyptic number.

It is an amenable number.

29987129797 is a deficient number, since it is larger than the sum of its proper divisors (154098619).

29987129797 is a wasteful number, since it uses less digits than its factorization.

29987129797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192987.

The product of its digits is 72013536, while the sum is 70.

The spelling of 29987129797 in words is "twenty-nine billion, nine hundred eighty-seven million, one hundred twenty-nine thousand, seven hundred ninety-seven".