29645681 has 12 divisors (see below), whose sum is σ = 33700212. Its totient is φ = 25920864.

The previous prime is 29645677. The next prime is 29645699. The reversal of 29645681 is 18654692.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9709456 + 19936225 = 3116^2 + 4465^2 .

It is not a de Polignac number, because 29645681 - 2² = 29645677 is a prime.

It is a super-2 number, since 2×29645681² = 1757732803907522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29645611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1535 + ... + 7851.

It is an arithmetic number, because the mean of its divisors is an integer number (2808351).

Almost surely, 2^29645681 is an apocalyptic number.

It is an amenable number.

29645681 is a deficient number, since it is larger than the sum of its proper divisors (4054531).

29645681 is a wasteful number, since it uses less digits than its factorization.

29645681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6368 (or 6349 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 29645681 is about 5444.7847524030. The cubic root of 29645681 is about 309.4951233830.

The spelling of 29645681 in words is "twenty-nine million, six hundred forty-five thousand, six hundred eighty-one".