72685534 has 4 divisors (see below), whose sum is σ = 109028304. Its totient is φ = 36342766.

The previous prime is 72685531. The next prime is 72685567. The reversal of 72685534 is 43558627.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72685531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18171382 + ... + 18171385.

It is an arithmetic number, because the mean of its divisors is an integer number (27257076).

Almost surely, 2^72685534 is an apocalyptic number.

72685534 is a deficient number, since it is larger than the sum of its proper divisors (36342770).

72685534 is a wasteful number, since it uses less digits than its factorization.

72685534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36342769.

The product of its digits is 201600, while the sum is 40.

The square root of 72685534 is about 8525.5811532118. The cubic root of 72685534 is about 417.3329370908.

The spelling of 72685534 in words is "seventy-two million, six hundred eighty-five thousand, five hundred thirty-four".