66802978 has 8 divisors (see below), whose sum is σ = 109314000. Its totient is φ = 30364980.

The previous prime is 66802963. The next prime is 66802987. The reversal of 66802978 is 87920866.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518228 + ... + 1518271.

It is an arithmetic number, because the mean of its divisors is an integer number (13664250).

Almost surely, 2^66802978 is an apocalyptic number.

66802978 is a deficient number, since it is larger than the sum of its proper divisors (42511022).

66802978 is a wasteful number, since it uses less digits than its factorization.

66802978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036512.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 66802978 is about 8173.3088770705. The cubic root of 66802978 is about 405.7563025863.

The spelling of 66802978 in words is "sixty-six million, eight hundred two thousand, nine hundred seventy-eight".