61729889 has 8 divisors (see below), whose sum is σ = 67320960. Its totient is φ = 56259216.

The previous prime is 61729859. The next prime is 61729909. The reversal of 61729889 is 98892716.

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

It is a de Polignac number, because none of the positive numbers 2^k-61729889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61729859) 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, 29027 + ... + 31080.

It is an arithmetic number, because the mean of its divisors is an integer number (8415120).

Almost surely, 2^61729889 is an apocalyptic number.

It is an amenable number.

61729889 is a deficient number, since it is larger than the sum of its proper divisors (5591071).

61729889 is a wasteful number, since it uses less digits than its factorization.

61729889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60199.

The product of its digits is 435456, while the sum is 50.

The square root of 61729889 is about 7856.8370862581. The cubic root of 61729889 is about 395.2135554073.

It can be divided in two parts, 6172 and 9889, that added together give a palindrome (16061).

The spelling of 61729889 in words is "sixty-one million, seven hundred twenty-nine thousand, eight hundred eighty-nine".