72061229 has 4 divisors (see below), whose sum is σ = 72078300. Its totient is φ = 72044160.

The previous prime is 72061217. The next prime is 72061261. The reversal of 72061229 is 92216027.

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: 92216027 = 29 ⋅3179863.

It can be written as a sum of positive squares in 2 ways, for example, as 11377129 + 60684100 = 3373^2 + 7790^2 .

It is a cyclic number.

It is not a de Polignac number, because 72061229 - 2²⁰ = 71012653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72061729) 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, 2939 + ... + 12359.

It is an arithmetic number, because the mean of its divisors is an integer number (18019575).

Almost surely, 2^72061229 is an apocalyptic number.

It is an amenable number.

72061229 is a deficient number, since it is larger than the sum of its proper divisors (17071).

72061229 is an equidigital number, since it uses as much as digits as its factorization.

72061229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17070.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 72061229 is about 8488.8885609366. Note that the first 3 decimals coincide. The cubic root of 72061229 is about 416.1346584683.

The spelling of 72061229 in words is "seventy-two million, sixty-one thousand, two hundred twenty-nine".