72037729 has 4 divisors (see below), whose sum is σ = 72780484. Its totient is φ = 71294976.

The previous prime is 72037727. The next prime is 72037733. The reversal of 72037729 is 92773027.

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 12006225 + 60031504 = 3465^2 + 7748^2 .

It is a cyclic number.

It is not a de Polignac number, because 72037729 - 2¹ = 72037727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72037727) 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, 371232 + ... + 371425.

It is an arithmetic number, because the mean of its divisors is an integer number (18195121).

Almost surely, 2^72037729 is an apocalyptic number.

It is an amenable number.

72037729 is a deficient number, since it is larger than the sum of its proper divisors (742755).

72037729 is an equidigital number, since it uses as much as digits as its factorization.

72037729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742754.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 72037729 is about 8487.5042857132. The cubic root of 72037729 is about 416.0894181089.

The spelling of 72037729 in words is "seventy-two million, thirty-seven thousand, seven hundred twenty-nine".