36723721 has 8 divisors (see below), whose sum is σ = 37815624. Its totient is φ = 35637120.

The previous prime is 36723719. The next prime is 36723733. The reversal of 36723721 is 12732763.

It can be written as a sum of positive squares in 4 ways, for example, as 2676496 + 34047225 = 1636^2 + 5835^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 36723721 - 2¹ = 36723719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36723221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15981 + ... + 18133.

It is an arithmetic number, because the mean of its divisors is an integer number (4726953).

Almost surely, 2^36723721 is an apocalyptic number.

It is an amenable number.

36723721 is a deficient number, since it is larger than the sum of its proper divisors (1091903).

36723721 is a wasteful number, since it uses less digits than its factorization.

36723721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651.

The product of its digits is 10584, while the sum is 31.

The square root of 36723721 is about 6060.0099834901. The cubic root of 36723721 is about 332.3907221875.

The spelling of 36723721 in words is "thirty-six million, seven hundred twenty-three thousand, seven hundred twenty-one".