61664878 has 8 divisors (see below), whose sum is σ = 100906200. Its totient is φ = 28029480.

The previous prime is 61664873. The next prime is 61664879. The reversal of 61664878 is 87846616.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61664873) 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 3 ways as a sum of consecutive naturals, for example, 1401453 + ... + 1401496.

It is an arithmetic number, because the mean of its divisors is an integer number (12613275).

Almost surely, 2^61664878 is an apocalyptic number.

61664878 is a deficient number, since it is larger than the sum of its proper divisors (39241322).

61664878 is a wasteful number, since it uses less digits than its factorization.

61664878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802962.

The product of its digits is 387072, while the sum is 46.

The square root of 61664878 is about 7852.6987717599. The cubic root of 61664878 is about 395.0747665980.

The spelling of 61664878 in words is "sixty-one million, six hundred sixty-four thousand, eight hundred seventy-eight".