29820640 has 24 divisors (see below), whose sum is σ = 70451640. Its totient is φ = 11928192.

The previous prime is 29820619. The next prime is 29820641. The reversal of 29820640 is 4602892.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29820641) by changing a digit.

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, 93030 + ... + 93349.

It is an arithmetic number, because the mean of its divisors is an integer number (2935485).

Almost surely, 2^29820640 is an apocalyptic number.

29820640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29820640 is an abundant number, since it is smaller than the sum of its proper divisors (40631000).

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

29820640 is a wasteful number, since it uses less digits than its factorization.

29820640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186394 (or 186386 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 29820640 is about 5460.8277760794. The cubic root of 29820640 is about 310.1027754960.

The spelling of 29820640 in words is "twenty-nine million, eight hundred twenty thousand, six hundred forty".