61659728 has 20 divisors (see below), whose sum is σ = 128655828. Its totient is φ = 28458240.

The previous prime is 61659707. The next prime is 61659733. The reversal of 61659728 is 82795616.

61659728 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 3717184 + 57942544 = 1928^2 + 7612^2 .

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, 148013 + ... + 148428.

Almost surely, 2^61659728 is an apocalyptic number.

It is an amenable number.

61659728 is an abundant number, since it is smaller than the sum of its proper divisors (66996100).

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

61659728 is a wasteful number, since it uses less digits than its factorization.

61659728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296462 (or 296456 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 61659728 is about 7852.3708521694. The cubic root of 61659728 is about 395.0637679456.

The spelling of 61659728 in words is "sixty-one million, six hundred fifty-nine thousand, seven hundred twenty-eight".