29931999779 has 24 divisors (see below), whose sum is σ = 33817203504. Its totient is φ = 26453908800.

The previous prime is 29931999743. The next prime is 29931999787. The reversal of 29931999779 is 97799913992.

It is not a de Polignac number, because 29931999779 - 2⁸ = 29931999523 is a prime.

It is a super-2 number, since 2×29931999779² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29931999719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8356769 + ... + 8360349.

It is an arithmetic number, because the mean of its divisors is an integer number (1409050146).

Almost surely, 2^29931999779 is an apocalyptic number.

29931999779 is a deficient number, since it is larger than the sum of its proper divisors (3885203725).

29931999779 is a wasteful number, since it uses less digits than its factorization.

29931999779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5507 (or 5496 counting only the distinct ones).

The product of its digits is 156243654, while the sum is 74.

The spelling of 29931999779 in words is "twenty-nine billion, nine hundred thirty-one million, nine hundred ninety-nine thousand, seven hundred seventy-nine".