61216564 has 12 divisors (see below), whose sum is σ = 110823300. Its totient is φ = 29552768.

The previous prime is 61216549. The next prime is 61216583. The reversal of 61216564 is 46561216.

61216564 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 10692900 + 50523664 = 3270^2 + 7108^2 .

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 3 ways as a sum of consecutive naturals, for example, 263749 + ... + 263980.

It is an arithmetic number, because the mean of its divisors is an integer number (9235275).

Almost surely, 2^61216564 is an apocalyptic number.

It is an amenable number.

61216564 is a deficient number, since it is larger than the sum of its proper divisors (49606736).

61216564 is a wasteful number, since it uses less digits than its factorization.

61216564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527762 (or 527760 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 61216564 is about 7824.1014819594. The cubic root of 61216564 is about 394.1150170534.

The spelling of 61216564 in words is "sixty-one million, two hundred sixteen thousand, five hundred sixty-four".