61966729 has 8 divisors (see below), whose sum is σ = 68133888. Its totient is φ = 55888560.

The previous prime is 61966711. The next prime is 61966753. The reversal of 61966729 is 92766916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61966729 - 2⁹ = 61966217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61066729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20782 + ... + 23575.

It is an arithmetic number, because the mean of its divisors is an integer number (8516736).

Almost surely, 2^61966729 is an apocalyptic number.

It is an amenable number.

61966729 is a deficient number, since it is larger than the sum of its proper divisors (6167159).

61966729 is a wasteful number, since it uses less digits than its factorization.

61966729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44495.

The product of its digits is 244944, while the sum is 46.

The square root of 61966729 is about 7871.8948798876. The cubic root of 61966729 is about 395.7183509822.

The spelling of 61966729 in words is "sixty-one million, nine hundred sixty-six thousand, seven hundred twenty-nine".