630978266 has 8 divisors (see below), whose sum is σ = 961983444. Its totient is φ = 310317120.

The previous prime is 630978253. The next prime is 630978281. The reversal of 630978266 is 662879036.

It can be written as a sum of positive squares in 2 ways, for example, as 413268241 + 217710025 = 20329^2 + 14755^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 630978266.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2585855 + ... + 2586098.

Almost surely, 2^630978266 is an apocalyptic number.

630978266 is a deficient number, since it is larger than the sum of its proper divisors (331005178).

630978266 is a wasteful number, since it uses less digits than its factorization.

630978266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5172016.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 630978266 is about 25119.2807619964. The cubic root of 630978266 is about 857.7053784200.

The spelling of 630978266 in words is "six hundred thirty million, nine hundred seventy-eight thousand, two hundred sixty-six".