72505543 has 8 divisors (see below), whose sum is σ = 79234560. Its totient is φ = 65799480.

The previous prime is 72505529. The next prime is 72505553. The reversal of 72505543 is 34550527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72505543 - 2⁹ = 72505031 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 (72505553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1248 + ... + 12106.

It is an arithmetic number, because the mean of its divisors is an integer number (9904320).

Almost surely, 2^72505543 is an apocalyptic number.

72505543 is a deficient number, since it is larger than the sum of its proper divisors (6729017).

72505543 is a wasteful number, since it uses less digits than its factorization.

72505543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11477.

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 72505543 is about 8515.0186729096. The cubic root of 72505543 is about 416.9881721960.

The spelling of 72505543 in words is "seventy-two million, five hundred five thousand, five hundred forty-three".