72245671 has 4 divisors (see below), whose sum is σ = 72286000. Its totient is φ = 72205344.

The previous prime is 72245669. The next prime is 72245687. The reversal of 72245671 is 17654227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17654227 = 1601 ⋅11027.

It is a cyclic number.

It is not a de Polignac number, because 72245671 - 2¹ = 72245669 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 (72245071) 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, 17346 + ... + 21103.

It is an arithmetic number, because the mean of its divisors is an integer number (18071500).

Almost surely, 2^72245671 is an apocalyptic number.

72245671 is a deficient number, since it is larger than the sum of its proper divisors (40329).

72245671 is a wasteful number, since it uses less digits than its factorization.

72245671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40328.

The product of its digits is 23520, while the sum is 34.

The square root of 72245671 is about 8499.7453491266. The cubic root of 72245671 is about 416.4893906842.

Adding to 72245671 its reverse (17654227), we get a palindrome (89899898).

The spelling of 72245671 in words is "seventy-two million, two hundred forty-five thousand, six hundred seventy-one".