61688656 has 10 divisors (see below), whose sum is σ = 119521802. Its totient is φ = 30844320.

The previous prime is 61688647. The next prime is 61688681. The reversal of 61688656 is 65688616.

61688656 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., 56490256 + 5198400 = 7516^2 + 2280^2 .

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 as a sum of consecutive naturals, namely, 1927755 + ... + 1927786.

Almost surely, 2^61688656 is an apocalyptic number.

It is an amenable number.

61688656 is a deficient number, since it is larger than the sum of its proper divisors (57833146).

61688656 is a wasteful number, since it uses less digits than its factorization.

61688656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855549 (or 3855543 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 61688656 is about 7854.2126276286. The cubic root of 61688656 is about 395.1255403983.

The spelling of 61688656 in words is "sixty-one million, six hundred eighty-eight thousand, six hundred fifty-six".