800728634 has 4 divisors (see below), whose sum is σ = 1201092954. Its totient is φ = 400364316.

The previous prime is 800728633. The next prime is 800728637. The reversal of 800728634 is 436827008.

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., 670654609 + 130074025 = 25897^2 + 11405^2 .

It is not an unprimeable number, because it can be changed into a prime (800728633) by changing a digit.

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, 200182157 + ... + 200182160.

Almost surely, 2^800728634 is an apocalyptic number.

800728634 is a deficient number, since it is larger than the sum of its proper divisors (400364320).

800728634 is a wasteful number, since it uses less digits than its factorization.

800728634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400364319.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 800728634 is about 28297.1488669795. The cubic root of 800728634 is about 928.5995161546.

The spelling of 800728634 in words is "eight hundred million, seven hundred twenty-eight thousand, six hundred thirty-four".