728070506 has 4 divisors (see below), whose sum is σ = 1092105762. Its totient is φ = 364035252.

The previous prime is 728070419. The next prime is 728070533. The reversal of 728070506 is 605070827.

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., 701455225 + 26615281 = 26485^2 + 5159^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182017625 + ... + 182017628.

Almost surely, 2^728070506 is an apocalyptic number.

728070506 is a deficient number, since it is larger than the sum of its proper divisors (364035256).

728070506 is a wasteful number, since it uses less digits than its factorization.

728070506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364035255.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 728070506 is about 26982.7816579388. The cubic root of 728070506 is about 899.6173294967.

The spelling of 728070506 in words is "seven hundred twenty-eight million, seventy thousand, five hundred six".