61728378 has 32 divisors (see below), whose sum is σ = 134154240. Its totient is φ = 18863280.

The previous prime is 61728367. The next prime is 61728391. The reversal of 61728378 is 87382716.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5200 + ... + 12267.

It is an arithmetic number, because the mean of its divisors is an integer number (4192320).

Almost surely, 2^61728378 is an apocalyptic number.

61728378 is an abundant number, since it is smaller than the sum of its proper divisors (72425862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61728378 is a wasteful number, since it uses less digits than its factorization.

61728378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17522.

The product of its digits is 112896, while the sum is 42.

The square root of 61728378 is about 7856.7409273820. The cubic root of 61728378 is about 395.2103307535.

The spelling of 61728378 in words is "sixty-one million, seven hundred twenty-eight thousand, three hundred seventy-eight".