1966478890 has 32 divisors (see below), whose sum is σ = 3571419600. Its totient is φ = 779564544.

The previous prime is 1966478879. The next prime is 1966478897. The reversal of 1966478890 is 988746691.

It can be written as a sum of positive squares in 8 ways, for example, as 1799371561 + 167107329 = 42419^2 + 12927^2 .

It is not an unprimeable number, because it can be changed into a prime (1966478897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 602142 + ... + 605398.

Almost surely, 2^1966478890 is an apocalyptic number.

1966478890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1966478890 is a deficient number, since it is larger than the sum of its proper divisors (1604940710).

1966478890 is a wasteful number, since it uses less digits than its factorization.

1966478890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The square root of 1966478890 is about 44344.9984778442. The cubic root of 1966478890 is about 1252.8423617515.

The spelling of 1966478890 in words is "one billion, nine hundred sixty-six million, four hundred seventy-eight thousand, eight hundred ninety".