72136745 has 8 divisors (see below), whose sum is σ = 87358920. Its totient is φ = 57179520.

The previous prime is 72136733. The next prime is 72136747. The reversal of 72136745 is 54763127.

It can be written as a sum of positive squares in 4 ways, for example, as 23541904 + 48594841 = 4852^2 + 6971^2 .

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

It is not a de Polignac number, because 72136745 - 2¹⁸ = 71874601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72136747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65636 + ... + 66725.

It is an arithmetic number, because the mean of its divisors is an integer number (10919865).

Almost surely, 2^72136745 is an apocalyptic number.

It is an amenable number.

72136745 is a deficient number, since it is larger than the sum of its proper divisors (15222175).

72136745 is a wasteful number, since it uses less digits than its factorization.

72136745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132475.

The product of its digits is 35280, while the sum is 35.

The square root of 72136745 is about 8493.3353283619. The cubic root of 72136745 is about 416.2799694053.

The spelling of 72136745 in words is "seventy-two million, one hundred thirty-six thousand, seven hundred forty-five".