723400666 has 4 divisors (see below), whose sum is σ = 1085101002. Its totient is φ = 361700332.

The previous prime is 723400663. The next prime is 723400681. The reversal of 723400666 is 666004327.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 690165441 + 33235225 = 26271^2 + 5765^2 .

It is not an unprimeable number, because it can be changed into a prime (723400663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180850165 + ... + 180850168.

Almost surely, 2^723400666 is an apocalyptic number.

723400666 is a deficient number, since it is larger than the sum of its proper divisors (361700336).

723400666 is a wasteful number, since it uses less digits than its factorization.

723400666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361700335.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 723400666 is about 26896.1087520109. The cubic root of 723400666 is about 897.6898224876.

The spelling of 723400666 in words is "seven hundred twenty-three million, four hundred thousand, six hundred sixty-six".