72947543 has 2 divisors, whose sum is σ = 72947544. Its totient is φ = 72947542.

The previous prime is 72947519. The next prime is 72947549. The reversal of 72947543 is 34574927.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72947543 - 2¹⁸ = 72685399 is a prime.

It is a super-3 number, since 3×72947543³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72947543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72947549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36473771 + 36473772.

It is an arithmetic number, because the mean of its divisors is an integer number (36473772).

Almost surely, 2^72947543 is an apocalyptic number.

72947543 is a deficient number, since it is larger than the sum of its proper divisors (1).

72947543 is an equidigital number, since it uses as much as digits as its factorization.

72947543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 41.

The square root of 72947543 is about 8540.9333799064. The cubic root of 72947543 is about 417.8337880716.

The spelling of 72947543 in words is "seventy-two million, nine hundred forty-seven thousand, five hundred forty-three".