72871229 has 4 divisors (see below), whose sum is σ = 75384060. Its totient is φ = 70358400.

The previous prime is 72871219. The next prime is 72871247. The reversal of 72871229 is 92217827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62047129 + 10824100 = 7877^2 + 3290^2 .

It is a cyclic number.

It is not a de Polignac number, because 72871229 - 2¹⁶ = 72805693 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72871192 and 72871201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72871219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1256372 + ... + 1256429.

It is an arithmetic number, because the mean of its divisors is an integer number (18846015).

Almost surely, 2^72871229 is an apocalyptic number.

It is an amenable number.

72871229 is a deficient number, since it is larger than the sum of its proper divisors (2512831).

72871229 is a wasteful number, since it uses less digits than its factorization.

72871229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512830.

The product of its digits is 28224, while the sum is 38.

The square root of 72871229 is about 8536.4646663593. The cubic root of 72871229 is about 417.6880317641.

The spelling of 72871229 in words is "seventy-two million, eight hundred seventy-one thousand, two hundred twenty-nine".