72140547 has 4 divisors (see below), whose sum is σ = 96187400. Its totient is φ = 48093696.

The previous prime is 72140533. The next prime is 72140557. The reversal of 72140547 is 74504127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74504127 = 3 ⋅24834709.

It is not a de Polignac number, because 72140547 - 2⁶ = 72140483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72140527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12023422 + ... + 12023427.

It is an arithmetic number, because the mean of its divisors is an integer number (24046850).

Almost surely, 2^72140547 is an apocalyptic number.

72140547 is a deficient number, since it is larger than the sum of its proper divisors (24046853).

72140547 is a wasteful number, since it uses less digits than its factorization.

72140547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24046852.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 72140547 is about 8493.5591479662. The cubic root of 72140547 is about 416.2872826853.

The spelling of 72140547 in words is "seventy-two million, one hundred forty thousand, five hundred forty-seven".