61641764 has 12 divisors (see below), whose sum is σ = 111353088. Its totient is φ = 29826600.

The previous prime is 61641763. The next prime is 61641773. The reversal of 61641764 is 46714616.

It is not an unprimeable number, because it can be changed into a prime (61641763) 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 3 ways as a sum of consecutive naturals, for example, 248432 + ... + 248679.

It is an arithmetic number, because the mean of its divisors is an integer number (9279424).

Almost surely, 2^61641764 is an apocalyptic number.

It is an amenable number.

61641764 is a deficient number, since it is larger than the sum of its proper divisors (49711324).

61641764 is a wasteful number, since it uses less digits than its factorization.

61641764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497146 (or 497144 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 61641764 is about 7851.2269104899. The cubic root of 61641764 is about 395.0253981426.

The spelling of 61641764 in words is "sixty-one million, six hundred forty-one thousand, seven hundred sixty-four".