29131688 has 8 divisors (see below), whose sum is σ = 54621930. Its totient is φ = 14565840.

The previous prime is 29131679. The next prime is 29131699. The reversal of 29131688 is 88613192.

It can be written as a sum of positive squares in only one way, i.e., 26234884 + 2896804 = 5122^2 + 1702^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820723 + ... + 1820738.

Almost surely, 2^29131688 is an apocalyptic number.

It is an amenable number.

29131688 is a deficient number, since it is larger than the sum of its proper divisors (25490242).

29131688 is a wasteful number, since it uses less digits than its factorization.

29131688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641467 (or 3641463 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 29131688 is about 5397.3778818978. The cubic root of 29131688 is about 307.6960232500.

The spelling of 29131688 in words is "twenty-nine million, one hundred thirty-one thousand, six hundred eighty-eight".