728307274 has 4 divisors (see below), whose sum is σ = 1092460914. Its totient is φ = 364153636.

The previous prime is 728307199. The next prime is 728307317. The reversal of 728307274 is 472703827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 472703827 = 67 ⋅7055281.

It can be written as a sum of positive squares in only one way, i.e., 694586025 + 33721249 = 26355^2 + 5807^2 .

It is a super-2 number, since 2×728307274² = 1060862970722622152, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182076817 + ... + 182076820.

Almost surely, 2^728307274 is an apocalyptic number.

728307274 is a deficient number, since it is larger than the sum of its proper divisors (364153640).

728307274 is a wasteful number, since it uses less digits than its factorization.

728307274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364153639.

The product of its (nonzero) digits is 131712, while the sum is 40.

The square root of 728307274 is about 26987.1686918061. The cubic root of 728307274 is about 899.7148372284.

The spelling of 728307274 in words is "seven hundred twenty-eight million, three hundred seven thousand, two hundred seventy-four".