66802378 has 4 divisors (see below), whose sum is σ = 100203570. Its totient is φ = 33401188.

The previous prime is 66802343. The next prime is 66802391. The reversal of 66802378 is 87320866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55398249 + 11404129 = 7443^2 + 3377^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66802378.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16700593 + ... + 16700596.

Almost surely, 2^66802378 is an apocalyptic number.

66802378 is a deficient number, since it is larger than the sum of its proper divisors (33401192).

66802378 is a wasteful number, since it uses less digits than its factorization.

66802378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33401191.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 66802378 is about 8173.2721721475. The cubic root of 66802378 is about 405.7550877976.

The spelling of 66802378 in words is "sixty-six million, eight hundred two thousand, three hundred seventy-eight".