61311636 has 36 divisors (see below), whose sum is σ = 158590432. Its totient is φ = 19961424.

The previous prime is 61311623. The next prime is 61311637. The reversal of 61311636 is 63611316.

It is a happy number.

61311636 is a `hidden beast` number, since 6 + 13 + 11 + 636 = 666.

61311636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61311637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18256 + ... + 21351.

Almost surely, 2^61311636 is an apocalyptic number.

It is an amenable number.

61311636 is an abundant number, since it is smaller than the sum of its proper divisors (97278796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61311636 is a wasteful number, since it uses less digits than its factorization.

61311636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39660 (or 39655 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 61311636 is about 7830.1747106945. The cubic root of 61311636 is about 394.3189374741.

The spelling of 61311636 in words is "sixty-one million, three hundred eleven thousand, six hundred thirty-six".