29681690 has 8 divisors (see below), whose sum is σ = 53427060. Its totient is φ = 11872672.

The previous prime is 29681689. The next prime is 29681719. The reversal of 29681690 is 9618692.

It can be written as a sum of positive squares in 2 ways, for example, as 29669809 + 11881 = 5447^2 + 109^2 .

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

It is a super-2 number, since 2×29681690² = 1762005442512200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1484075 + ... + 1484094.

Almost surely, 2^29681690 is an apocalyptic number.

29681690 is a deficient number, since it is larger than the sum of its proper divisors (23745370).

29681690 is a wasteful number, since it uses less digits than its factorization.

29681690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968176.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 29681690 is about 5448.0904911721. The cubic root of 29681690 is about 309.6203816591.

The spelling of 29681690 in words is "twenty-nine million, six hundred eighty-one thousand, six hundred ninety".