29720000 has 70 divisors (see below), whose sum is σ = 73795128. Its totient is φ = 11872000.

The previous prime is 29719997. The next prime is 29720003. The reversal of 29720000 is 2792.

It is an interprime number because it is at equal distance from previous prime (29719997) and next prime (29720003).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29720003) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 39629 + ... + 40371.

Almost surely, 2^29720000 is an apocalyptic number.

29720000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36897564).

29720000 is an abundant number, since it is smaller than the sum of its proper divisors (44075128).

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

29720000 is an frugal number, since it uses more digits than its factorization.

29720000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 29720000 is about 5451.6052681756. The cubic root of 29720000 is about 309.7535328517.

Adding to 29720000 its reverse (2792), we get a palindrome (29722792).

The spelling of 29720000 in words is "twenty-nine million, seven hundred twenty thousand".