29971644 has 12 divisors (see below), whose sum is σ = 69933864. Its totient is φ = 9990544.

The previous prime is 29971577. The next prime is 29971651. The reversal of 29971644 is 44617992.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 29971596 and 29971605.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1248807 + ... + 1248830.

It is an arithmetic number, because the mean of its divisors is an integer number (5827822).

Almost surely, 2^29971644 is an apocalyptic number.

It is an amenable number.

29971644 is an abundant number, since it is smaller than the sum of its proper divisors (39962220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29971644 is a wasteful number, since it uses less digits than its factorization.

29971644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497644 (or 2497642 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 29971644 is about 5474.6364262844. The cubic root of 29971644 is about 310.6253211958.

The spelling of 29971644 in words is "twenty-nine million, nine hundred seventy-one thousand, six hundred forty-four".