728854666 has 4 divisors (see below), whose sum is σ = 1093282002. Its totient is φ = 364427332.

The previous prime is 728854627. The next prime is 728854667. The reversal of 728854666 is 666458827.

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., 432016225 + 296838441 = 20785^2 + 17229^2 .

It is not an unprimeable number, because it can be changed into a prime (728854667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182213665 + ... + 182213668.

Almost surely, 2^728854666 is an apocalyptic number.

728854666 is a deficient number, since it is larger than the sum of its proper divisors (364427336).

728854666 is a wasteful number, since it uses less digits than its factorization.

728854666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364427335.

The product of its digits is 3870720, while the sum is 52.

The square root of 728854666 is about 26997.3084954778. The cubic root of 728854666 is about 899.9401877946.

The spelling of 728854666 in words is "seven hundred twenty-eight million, eight hundred fifty-four thousand, six hundred sixty-six".