61728389 has 8 divisors (see below), whose sum is σ = 64491072. Its totient is φ = 58972320.

The previous prime is 61728367. The next prime is 61728391. The reversal of 61728389 is 98382716.

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 61728389 - 2⁸ = 61728133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61728319) 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, 34337 + ... + 36089.

It is an arithmetic number, because the mean of its divisors is an integer number (8061384).

Almost surely, 2^61728389 is an apocalyptic number.

It is an amenable number.

61728389 is a deficient number, since it is larger than the sum of its proper divisors (2762683).

61728389 is a wasteful number, since it uses less digits than its factorization.

61728389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307.

The product of its digits is 145152, while the sum is 44.

The square root of 61728389 is about 7856.7416274178. The cubic root of 61728389 is about 395.2103542290.

The spelling of 61728389 in words is "sixty-one million, seven hundred twenty-eight thousand, three hundred eighty-nine".