72040447 has 4 divisors (see below), whose sum is σ = 72172696. Its totient is φ = 71908200.

The previous prime is 72040429. The next prime is 72040453. The reversal of 72040447 is 74404027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74404027 = 157 ⋅473911.

It is a cyclic number.

It is not a de Polignac number, because 72040447 - 2¹¹ = 72038399 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 (72040547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65304 + ... + 66397.

It is an arithmetic number, because the mean of its divisors is an integer number (18043174).

Almost surely, 2^72040447 is an apocalyptic number.

72040447 is a deficient number, since it is larger than the sum of its proper divisors (132249).

72040447 is a wasteful number, since it uses less digits than its factorization.

72040447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132248.

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 72040447 is about 8487.6644019424. The cubic root of 72040447 is about 416.0946510928.

The spelling of 72040447 in words is "seventy-two million, forty thousand, four hundred forty-seven".