61389664 has 24 divisors (see below), whose sum is σ = 138127248. Its totient is φ = 26309760.

The previous prime is 61389659. The next prime is 61389707. The reversal of 61389664 is 46698316.

61389664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 61389664.

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, 136807 + ... + 137254.

It is an arithmetic number, because the mean of its divisors is an integer number (5755302).

Almost surely, 2^61389664 is an apocalyptic number.

It is an amenable number.

61389664 is an abundant number, since it is smaller than the sum of its proper divisors (76737584).

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

61389664 is a wasteful number, since it uses less digits than its factorization.

61389664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274078 (or 274070 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 61389664 is about 7835.1556461885. The cubic root of 61389664 is about 394.4861426849.

The spelling of 61389664 in words is "sixty-one million, three hundred eighty-nine thousand, six hundred sixty-four".