2066978 has 4 divisors (see below), whose sum is σ = 3100470. Its totient is φ = 1033488.

The previous prime is 2066971. The next prime is 2066989. The reversal of 2066978 is 8796602.

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., 1399489 + 667489 = 1183^2 + 817^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2066971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 516743 + ... + 516746.

2^2066978 is an apocalyptic number.

2066978 is a deficient number, since it is larger than the sum of its proper divisors (1033492).

2066978 is a wasteful number, since it uses less digits than its factorization.

2066978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033491.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 2066978 is about 1437.6988558109. The cubic root of 2066978 is about 127.3831403944.

The spelling of 2066978 in words is "two million, sixty-six thousand, nine hundred seventy-eight".