72219029 has 4 divisors (see below), whose sum is σ = 72236076. Its totient is φ = 72201984.

The previous prime is 72219001. The next prime is 72219031. The reversal of 72219029 is 92091227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92091227 = 17 ⋅5417131.

It can be written as a sum of positive squares in 2 ways, for example, as 2044900 + 70174129 = 1430^2 + 8377^2 .

It is a cyclic number.

It is not a de Polignac number, because 72219029 - 2²⁰ = 71170453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72218986 and 72219004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72219089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3287 + ... + 12459.

It is an arithmetic number, because the mean of its divisors is an integer number (18059019).

Almost surely, 2^72219029 is an apocalyptic number.

It is an amenable number.

72219029 is a deficient number, since it is larger than the sum of its proper divisors (17047).

72219029 is an equidigital number, since it uses as much as digits as its factorization.

72219029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17046.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 72219029 is about 8498.1779811910. The cubic root of 72219029 is about 416.4381881949.

The spelling of 72219029 in words is "seventy-two million, two hundred nineteen thousand, twenty-nine".