36570721 has 4 divisors (see below), whose sum is σ = 39895344. Its totient is φ = 33246100.

The previous prime is 36570707. The next prime is 36570727. The reversal of 36570721 is 12707563.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12707563 = 11 ⋅1155233.

It is a cyclic number.

It is not a de Polignac number, because 36570721 - 2⁷ = 36570593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36570727) 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, 1662295 + ... + 1662316.

It is an arithmetic number, because the mean of its divisors is an integer number (9973836).

Almost surely, 2^36570721 is an apocalyptic number.

It is an amenable number.

36570721 is a deficient number, since it is larger than the sum of its proper divisors (3324623).

36570721 is a wasteful number, since it uses less digits than its factorization.

36570721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324622.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 36570721 is about 6047.3730660511. The cubic root of 36570721 is about 331.9284726396.

The spelling of 36570721 in words is "thirty-six million, five hundred seventy thousand, seven hundred twenty-one".