719973666 has 12 divisors (see below), whose sum is σ = 1559942982. Its totient is φ = 239991216.

The previous prime is 719973659. The next prime is 719973703. The reversal of 719973666 is 666379917.

It can be written as a sum of positive squares in only one way, i.e., 421686225 + 298287441 = 20535^2 + 17271^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19999251 + ... + 19999286.

Almost surely, 2^719973666 is an apocalyptic number.

719973666 is an abundant number, since it is smaller than the sum of its proper divisors (839969316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

719973666 is a wasteful number, since it uses less digits than its factorization.

719973666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39998545 (or 39998542 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 54.

The square root of 719973666 is about 26832.3250203928. The cubic root of 719973666 is about 896.2700220196.

The spelling of 719973666 in words is "seven hundred nineteen million, nine hundred seventy-three thousand, six hundred sixty-six".