61766729 has 4 divisors (see below), whose sum is σ = 65400084. Its totient is φ = 58133376.

The previous prime is 61766717. The next prime is 61766741. The reversal of 61766729 is 92766716.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61766717) and next prime (61766741).

It can be written as a sum of positive squares in 2 ways, for example, as 26245129 + 35521600 = 5123^2 + 5960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61766729 is a prime.

It is a super-2 number, since 2×61766729² = 7630257622718882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61766729.

It is not an unprimeable number, because it can be changed into a prime (61766759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1816652 + ... + 1816685.

It is an arithmetic number, because the mean of its divisors is an integer number (16350021).

Almost surely, 2^61766729 is an apocalyptic number.

It is an amenable number.

61766729 is a deficient number, since it is larger than the sum of its proper divisors (3633355).

61766729 is a wasteful number, since it uses less digits than its factorization.

61766729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633354.

The product of its digits is 190512, while the sum is 44.

The square root of 61766729 is about 7859.1811914474. The cubic root of 61766729 is about 395.2921600735.

The spelling of 61766729 in words is "sixty-one million, seven hundred sixty-six thousand, seven hundred twenty-nine".