61646990 has 16 divisors (see below), whose sum is σ = 111320352. Its totient is φ = 24579744.

The previous prime is 61646989. The next prime is 61647017. The reversal of 61646990 is 9964616.

61646990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 6554 + ... + 12893.

It is an arithmetic number, because the mean of its divisors is an integer number (6957522).

Almost surely, 2^61646990 is an apocalyptic number.

61646990 is a deficient number, since it is larger than the sum of its proper divisors (49673362).

61646990 is a wasteful number, since it uses less digits than its factorization.

61646990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19771.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 61646990 is about 7851.5597176612. The cubic root of 61646990 is about 395.0365612689.

The spelling of 61646990 in words is "sixty-one million, six hundred forty-six thousand, nine hundred ninety".