728504666 has 4 divisors (see below), whose sum is σ = 1092757002. Its totient is φ = 364252332.

The previous prime is 728504641. The next prime is 728504671. The reversal of 728504666 is 666405827.

728504666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666405827 = 199 ⋅3348773.

It can be written as a sum of positive squares in only one way, i.e., 446096641 + 282408025 = 21121^2 + 16805^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182126165 + ... + 182126168.

Almost surely, 2^728504666 is an apocalyptic number.

728504666 is a deficient number, since it is larger than the sum of its proper divisors (364252336).

728504666 is a wasteful number, since it uses less digits than its factorization.

728504666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364252335.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 728504666 is about 26990.8255894480. The cubic root of 728504666 is about 899.7961126623.

The spelling of 728504666 in words is "seven hundred twenty-eight million, five hundred four thousand, six hundred sixty-six".