66889078 has 8 divisors (see below), whose sum is σ = 100894680. Its totient is φ = 33257520.

The previous prime is 66889057. The next prime is 66889079. The reversal of 66889078 is 87098866.

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 (66889079) 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, 93063 + ... + 93778.

It is an arithmetic number, because the mean of its divisors is an integer number (12611835).

Almost surely, 2^66889078 is an apocalyptic number.

66889078 is a deficient number, since it is larger than the sum of its proper divisors (34005602).

66889078 is a wasteful number, since it uses less digits than its factorization.

66889078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187022.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 66889078 is about 8178.5743256389. The cubic root of 66889078 is about 405.9305494056.

The spelling of 66889078 in words is "sixty-six million, eight hundred eighty-nine thousand, seventy-eight".