61728347 has 8 divisors (see below), whose sum is σ = 64146432. Its totient is φ = 59337000.

The previous prime is 61728319. The next prime is 61728367. The reversal of 61728347 is 74382716.

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 61728347 - 2²⁰ = 60679771 is a prime.

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 61728347.

It is not an unprimeable number, because it can be changed into a prime (61728367) 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, 1913 + ... + 11274.

It is an arithmetic number, because the mean of its divisors is an integer number (8018304).

Almost surely, 2^61728347 is an apocalyptic number.

61728347 is a deficient number, since it is larger than the sum of its proper divisors (2418085).

61728347 is a wasteful number, since it uses less digits than its factorization.

61728347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13369.

The product of its digits is 56448, while the sum is 38.

The square root of 61728347 is about 7856.7389545536. The cubic root of 61728347 is about 395.2102645953.

The spelling of 61728347 in words is "sixty-one million, seven hundred twenty-eight thousand, three hundred forty-seven".