36640993 has 4 divisors (see below), whose sum is σ = 36653508. Its totient is φ = 36628480.

The previous prime is 36640991. The next prime is 36641021. The reversal of 36640993 is 39904663.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39904663 = 89 ⋅448367.

It can be written as a sum of positive squares in 2 ways, for example, as 25928464 + 10712529 = 5092^2 + 3273^2 .

It is a cyclic number.

It is not a de Polignac number, because 36640993 - 2¹ = 36640991 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36640991) 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, 753 + ... + 8593.

It is an arithmetic number, because the mean of its divisors is an integer number (9163377).

It is a 2928-hyperperfect number.

Almost surely, 2^36640993 is an apocalyptic number.

It is an amenable number.

36640993 is a deficient number, since it is larger than the sum of its proper divisors (12515).

36640993 is an equidigital number, since it uses as much as digits as its factorization.

36640993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12514.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 36640993 is about 6053.1804037217. The cubic root of 36640993 is about 332.1409409092.

The spelling of 36640993 in words is "thirty-six million, six hundred forty thousand, nine hundred ninety-three".