29721980 has 24 divisors (see below), whose sum is σ = 65130912. Its totient is φ = 11371712.

The previous prime is 29721973. The next prime is 29721997. The reversal of 29721980 is 8912792.

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 7 ways as a sum of consecutive naturals, for example, 31847 + ... + 32766.

It is an arithmetic number, because the mean of its divisors is an integer number (2713788).

Almost surely, 2^29721980 is an apocalyptic number.

29721980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29721980 is an abundant number, since it is smaller than the sum of its proper divisors (35408932).

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

29721980 is a wasteful number, since it uses less digits than its factorization.

29721980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64645 (or 64643 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 29721980 is about 5451.7868630386. The cubic root of 29721980 is about 309.7604114786.

The spelling of 29721980 in words is "twenty-nine million, seven hundred twenty-one thousand, nine hundred eighty".