978262666 has 8 divisors (see below), whose sum is σ = 1468607364. Its totient is φ = 488726880.

The previous prime is 978262627. The next prime is 978262667. The reversal of 978262666 is 666262879.

978262666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 969388225 + 8874441 = 31135^2 + 2979^2 .

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

It is not an unprimeable number, because it can be changed into a prime (978262667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199195 + ... + 204046.

Almost surely, 2^978262666 is an apocalyptic number.

978262666 is a deficient number, since it is larger than the sum of its proper divisors (490344698).

978262666 is a wasteful number, since it uses less digits than its factorization.

978262666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404456.

The product of its digits is 2612736, while the sum is 52.

The square root of 978262666 is about 31277.1908265432. The cubic root of 978262666 is about 992.7010773430.

The spelling of 978262666 in words is "nine hundred seventy-eight million, two hundred sixty-two thousand, six hundred sixty-six".