72655543 has 4 divisors (see below), whose sum is σ = 72696208. Its totient is φ = 72614880.

The previous prime is 72655511. The next prime is 72655549. The reversal of 72655543 is 34555627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34555627 = 79 ⋅437413.

It is a cyclic number.

It is not a de Polignac number, because 72655543 - 2⁵ = 72655511 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 (72655549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17523 + ... + 21268.

It is an arithmetic number, because the mean of its divisors is an integer number (18174052).

Almost surely, 2^72655543 is an apocalyptic number.

72655543 is a deficient number, since it is larger than the sum of its proper divisors (40665).

72655543 is a wasteful number, since it uses less digits than its factorization.

72655543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40664.

The product of its digits is 126000, while the sum is 37.

The square root of 72655543 is about 8523.8220887111. The cubic root of 72655543 is about 417.2755301889.

The spelling of 72655543 in words is "seventy-two million, six hundred fifty-five thousand, five hundred forty-three".