61994729 has 8 divisors (see below), whose sum is σ = 64772160. Its totient is φ = 59224176.

The previous prime is 61994719. The next prime is 61994743. The reversal of 61994729 is 92749916.

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 61994729 - 2¹² = 61990633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61994719) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27362 + ... + 29540.

It is an arithmetic number, because the mean of its divisors is an integer number (8096520).

Almost surely, 2^61994729 is an apocalyptic number.

It is an amenable number.

61994729 is a deficient number, since it is larger than the sum of its proper divisors (2777431).

61994729 is a wasteful number, since it uses less digits than its factorization.

61994729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439.

The product of its digits is 244944, while the sum is 47.

The square root of 61994729 is about 7873.6731580629. The cubic root of 61994729 is about 395.7779444960. Note that the first 3 decimals are identical.

The spelling of 61994729 in words is "sixty-one million, nine hundred ninety-four thousand, seven hundred twenty-nine".