61728394 has 64 divisors (see below), whose sum is σ = 122798592. Its totient is φ = 22579200.

The previous prime is 61728391. The next prime is 61728413. The reversal of 61728394 is 49382716.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61728391) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219534 + ... + 219814.

It is an arithmetic number, because the mean of its divisors is an integer number (1918728).

Almost surely, 2^61728394 is an apocalyptic number.

61728394 is a deficient number, since it is larger than the sum of its proper divisors (61070198).

61728394 is a wasteful number, since it uses less digits than its factorization.

61728394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391.

The product of its digits is 72576, while the sum is 40.

The square root of 61728394 is about 7856.7419456159. The cubic root of 61728394 is about 395.2103648997.

The spelling of 61728394 in words is "sixty-one million, seven hundred twenty-eight thousand, three hundred ninety-four".