36636781 has 8 divisors (see below), whose sum is σ = 37606464. Its totient is φ = 35679840.

The previous prime is 36636779. The next prime is 36636797. The reversal of 36636781 is 18763663.

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 36636781 - 2¹ = 36636779 is a prime.

It is a super-2 number, since 2×36636781² = 2684507444083922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36636881) 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, 2785 + ... + 9001.

It is an arithmetic number, because the mean of its divisors is an integer number (4700808).

Almost surely, 2^36636781 is an apocalyptic number.

It is an amenable number.

36636781 is a deficient number, since it is larger than the sum of its proper divisors (969683).

36636781 is an equidigital number, since it uses as much as digits as its factorization.

36636781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6371.

The product of its digits is 108864, while the sum is 40.

The square root of 36636781 is about 6052.8324774439. The cubic root of 36636781 is about 332.1282135316.

The spelling of 36636781 in words is "thirty-six million, six hundred thirty-six thousand, seven hundred eighty-one".