61688718 has 72 divisors (see below), whose sum is σ = 165464208. Its totient is φ = 16263936.

The previous prime is 61688717. The next prime is 61688743. The reversal of 61688718 is 81788616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61688717) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19846 + ... + 22742.

It is an arithmetic number, because the mean of its divisors is an integer number (2298114).

Almost surely, 2^61688718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61688718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82732104).

61688718 is an abundant number, since it is smaller than the sum of its proper divisors (103775490).

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

61688718 is a wasteful number, since it uses less digits than its factorization.

61688718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938 (or 2922 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 61688718 is about 7854.2165745541. The cubic root of 61688718 is about 395.1256727716.

The spelling of 61688718 in words is "sixty-one million, six hundred eighty-eight thousand, seven hundred eighteen".