29720225 has 12 divisors (see below), whose sum is σ = 37299696. Its totient is φ = 23488080.

The previous prime is 29720221. The next prime is 29720239. The reversal of 29720225 is 52202792.

It is not a de Polignac number, because 29720225 - 2² = 29720221 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29720221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5087 + ... + 9236.

It is an arithmetic number, because the mean of its divisors is an integer number (3108308).

Almost surely, 2^29720225 is an apocalyptic number.

29720225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

29720225 is a deficient number, since it is larger than the sum of its proper divisors (7579471).

29720225 is a wasteful number, since it uses less digits than its factorization.

29720225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14416 (or 14411 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 29720225 is about 5451.6259042601. The cubic root of 29720225 is about 309.7543145292.

The spelling of 29720225 in words is "twenty-nine million, seven hundred twenty thousand, two hundred twenty-five".