72743537 has 4 divisors (see below), whose sum is σ = 73936116. Its totient is φ = 71550960.

The previous prime is 72743521. The next prime is 72743543. The reversal of 72743537 is 73534727.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7311616 + 65431921 = 2704^2 + 8089^2 .

It is a cyclic number.

It is not a de Polignac number, because 72743537 - 2⁴ = 72743521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72743537.

It is not an unprimeable number, because it can be changed into a prime (72743557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 596198 + ... + 596319.

It is an arithmetic number, because the mean of its divisors is an integer number (18484029).

Almost surely, 2^72743537 is an apocalyptic number.

It is an amenable number.

72743537 is a deficient number, since it is larger than the sum of its proper divisors (1192579).

72743537 is a wasteful number, since it uses less digits than its factorization.

72743537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192578.

The product of its digits is 123480, while the sum is 38.

The square root of 72743537 is about 8528.9821784314. The cubic root of 72743537 is about 417.4439180290.

The spelling of 72743537 in words is "seventy-two million, seven hundred forty-three thousand, five hundred thirty-seven".