29889640 has 32 divisors (see below), whose sum is σ = 73366560. Its totient is φ = 10868800.

The previous prime is 29889623. The next prime is 29889659. The reversal of 29889640 is 4698892.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33526 + ... + 34405.

It is an arithmetic number, because the mean of its divisors is an integer number (2292705).

Almost surely, 2^29889640 is an apocalyptic number.

29889640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29889640 is an abundant number, since it is smaller than the sum of its proper divisors (43476920).

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

29889640 is a wasteful number, since it uses less digits than its factorization.

29889640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67953 (or 67949 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 29889640 is about 5467.1418492664. The cubic root of 29889640 is about 310.3417666734.

The spelling of 29889640 in words is "twenty-nine million, eight hundred eighty-nine thousand, six hundred forty".