29972656 has 20 divisors (see below), whose sum is σ = 66368272. Its totient is φ = 12845376.

The previous prime is 29972647. The next prime is 29972687. The reversal of 29972656 is 65627992.

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, 133695 + ... + 133918.

Almost surely, 2^29972656 is an apocalyptic number.

It is an amenable number.

29972656 is an abundant number, since it is smaller than the sum of its proper divisors (36395616).

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

29972656 is a wasteful number, since it uses less digits than its factorization.

29972656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267628 (or 267622 counting only the distinct ones).

The product of its digits is 408240, while the sum is 46.

The square root of 29972656 is about 5474.7288517332. The cubic root of 29972656 is about 310.6288172701.

It can be divided in two parts, 29972 and 656, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 29972656 in words is "twenty-nine million, nine hundred seventy-two thousand, six hundred fifty-six".