61728678 has 48 divisors (see below), whose sum is σ = 147992832. Its totient is φ = 18438000.

The previous prime is 61728673. The next prime is 61728679. The reversal of 61728678 is 87682716.

61728678 is a `hidden beast` number, since 617 + 28 + 6 + 7 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61728671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11863 + ... + 16253.

It is an arithmetic number, because the mean of its divisors is an integer number (3083184).

Almost surely, 2^61728678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61728678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73996416).

61728678 is an abundant number, since it is smaller than the sum of its proper divisors (86264154).

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

61728678 is a wasteful number, since it uses less digits than its factorization.

61728678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4481 (or 4478 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 61728678 is about 7856.7600192446. The cubic root of 61728678 is about 395.2109709934.

The spelling of 61728678 in words is "sixty-one million, seven hundred twenty-eight thousand, six hundred seventy-eight".