61109864 has 8 divisors (see below), whose sum is σ = 114581010. Its totient is φ = 30554928.

The previous prime is 61109863. The next prime is 61109879. The reversal of 61109864 is 46890116.

61109864 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 only one way, i.e., 58644964 + 2464900 = 7658^2 + 1570^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (61109863) 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 as a sum of consecutive naturals, namely, 3819359 + ... + 3819374.

Almost surely, 2^61109864 is an apocalyptic number.

It is an amenable number.

61109864 is a deficient number, since it is larger than the sum of its proper divisors (53471146).

61109864 is a wasteful number, since it uses less digits than its factorization.

61109864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7638739 (or 7638735 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 61109864 is about 7817.2798338041. The cubic root of 61109864 is about 393.8859040737.

The spelling of 61109864 in words is "sixty-one million, one hundred nine thousand, eight hundred sixty-four".