61641786 has 8 divisors (see below), whose sum is σ = 123283584. Its totient is φ = 20547260.

The previous prime is 61641773. The next prime is 61641787. The reversal of 61641786 is 68714616.

It is a happy number.

61641786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

61641786 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (61641787) 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 3 ways as a sum of consecutive naturals, for example, 5136810 + ... + 5136821.

It is an arithmetic number, because the mean of its divisors is an integer number (15410448).

Almost surely, 2^61641786 is an apocalyptic number.

61641786 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61641786 is a wasteful number, since it uses less digits than its factorization.

61641786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10273636.

The product of its digits is 48384, while the sum is 39.

The square root of 61641786 is about 7851.2283115446. The cubic root of 61641786 is about 395.0254451375.

The spelling of 61641786 in words is "sixty-one million, six hundred forty-one thousand, seven hundred eighty-six".