61712766 has 36 divisors (see below), whose sum is σ = 138876192. Its totient is φ = 20566548.

The previous prime is 61712753. The next prime is 61712789. The reversal of 61712766 is 66721716.

It is a self number, because there is not a number n which added to its sum of digits gives 61712766.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 10771 + ... + 15473.

It is an arithmetic number, because the mean of its divisors is an integer number (3857672).

Almost surely, 2^61712766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61712766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69438096).

61712766 is an abundant number, since it is smaller than the sum of its proper divisors (77163426).

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

61712766 is an frugal number, since it uses more digits than its factorization.

61712766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729 (or 4708 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 61712766 is about 7855.7473228204. The cubic root of 61712766 is about 395.1770098071.

The spelling of 61712766 in words is "sixty-one million, seven hundred twelve thousand, seven hundred sixty-six".