723822666 has 16 divisors (see below), whose sum is σ = 1654451904. Its totient is φ = 206806464.

The previous prime is 723822611. The next prime is 723822703. The reversal of 723822666 is 666228327.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 17233873 = 723822666 / (7 + 2 + 3 + 8 + 2 + 2 + 6 + 6 + 6).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8616895 + ... + 8616978.

It is an arithmetic number, because the mean of its divisors is an integer number (103403244).

Almost surely, 2^723822666 is an apocalyptic number.

723822666 is an abundant number, since it is smaller than the sum of its proper divisors (930629238).

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

723822666 is a wasteful number, since it uses less digits than its factorization.

723822666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17233885.

The product of its digits is 290304, while the sum is 42.

The square root of 723822666 is about 26903.9526092357. The cubic root of 723822666 is about 897.8643460877.

The spelling of 723822666 in words is "seven hundred twenty-three million, eight hundred twenty-two thousand, six hundred sixty-six".