36721729 has 4 divisors (see below), whose sum is σ = 40060080. Its totient is φ = 33383380.

The previous prime is 36721693. The next prime is 36721757. The reversal of 36721729 is 92712763.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 36721729 - 2¹¹ = 36719681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36721799) 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, 1669159 + ... + 1669180.

It is an arithmetic number, because the mean of its divisors is an integer number (10015020).

Almost surely, 2^36721729 is an apocalyptic number.

It is an amenable number.

36721729 is a deficient number, since it is larger than the sum of its proper divisors (3338351).

36721729 is a wasteful number, since it uses less digits than its factorization.

36721729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338350.

The product of its digits is 31752, while the sum is 37.

The square root of 36721729 is about 6059.8456250964. The cubic root of 36721729 is about 332.3847121366.

The spelling of 36721729 in words is "thirty-six million, seven hundred twenty-one thousand, seven hundred twenty-nine".