72356543 has 4 divisors (see below), whose sum is σ = 82693200. Its totient is φ = 62019888.

The previous prime is 72356507. The next prime is 72356561. The reversal of 72356543 is 34565327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34565327 = 59 ⋅585853.

It is not a de Polignac number, because 72356543 - 2⁸ = 72356287 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 (72356563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5168318 + ... + 5168331.

It is an arithmetic number, because the mean of its divisors is an integer number (20673300).

Almost surely, 2^72356543 is an apocalyptic number.

72356543 is a deficient number, since it is larger than the sum of its proper divisors (10336657).

72356543 is a wasteful number, since it uses less digits than its factorization.

72356543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10336656.

The product of its digits is 75600, while the sum is 35.

The square root of 72356543 is about 8506.2649265115. The cubic root of 72356543 is about 416.7023372839.

The spelling of 72356543 in words is "seventy-two million, three hundred fifty-six thousand, five hundred forty-three".