61646660 has 12 divisors (see below), whose sum is σ = 129458028. Its totient is φ = 24658656.

The previous prime is 61646653. The next prime is 61646671. The reversal of 61646660 is 6664616.

61646660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 48916036 = 3568^2 + 6994^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61646660.

It is an unprimeable number.

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, 1541147 + ... + 1541186.

It is an arithmetic number, because the mean of its divisors is an integer number (10788169).

Almost surely, 2^61646660 is an apocalyptic number.

It is an amenable number.

61646660 is an abundant number, since it is smaller than the sum of its proper divisors (67811368).

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

61646660 is a wasteful number, since it uses less digits than its factorization.

61646660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082342 (or 3082340 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 61646660 is about 7851.5387027003. The cubic root of 61646660 is about 395.0358563829.

The spelling of 61646660 in words is "sixty-one million, six hundred forty-six thousand, six hundred sixty".