36638809 has 3 divisors (see below), whose sum is σ = 36644863. Its totient is φ = 36632756.

The previous prime is 36638761. The next prime is 36638813. The reversal of 36638809 is 90883663.

The square root of 36638809 is 6053.

It is a perfect power (a square), and thus also a powerful number.

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.

It can be written as a sum of positive squares in only one way, i.e., 2673225 + 33965584 = 1635^2 + 5828^2 .

It is not a de Polignac number, because 36638809 - 2⁷ = 36638681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36638509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3027 + ... + 9079.

Almost surely, 2^36638809 is an apocalyptic number.

36638809 is the 6053-rd square number.

36638809 is the 3027-th centered octagonal number.

It is an amenable number.

36638809 is a deficient number, since it is larger than the sum of its proper divisors (6054).

36638809 is an frugal number, since it uses more digits than its factorization.

36638809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12106 (or 6053 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The cubic root of 36638809 is about 332.1343416500.

Multiplying 36638809 by its product of nonzero digits (186624), we get a square (6837681090816 = 2614896²).

The spelling of 36638809 in words is "thirty-six million, six hundred thirty-eight thousand, eight hundred nine".