72215329 has 4 divisors (see below), whose sum is σ = 72490176. Its totient is φ = 71940484.

The previous prime is 72215327. The next prime is 72215369. The reversal of 72215329 is 92351227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92351227 = 1453 ⋅63559.

It is a cyclic number.

It is not a de Polignac number, because 72215329 - 2¹ = 72215327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72215329.

It is not an unprimeable number, because it can be changed into a prime (72215327) 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 3 ways as a sum of consecutive naturals, for example, 137029 + ... + 137554.

It is an arithmetic number, because the mean of its divisors is an integer number (18122544).

Almost surely, 2^72215329 is an apocalyptic number.

It is an amenable number.

72215329 is a deficient number, since it is larger than the sum of its proper divisors (274847).

72215329 is a wasteful number, since it uses less digits than its factorization.

72215329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274846.

The product of its digits is 7560, while the sum is 31.

The square root of 72215329 is about 8497.9602846801. The cubic root of 72215329 is about 416.4310762761.

The spelling of 72215329 in words is "seventy-two million, two hundred fifteen thousand, three hundred twenty-nine".