728637871 has 4 divisors (see below), whose sum is σ = 784686952. Its totient is φ = 672588792.

The previous prime is 728637869. The next prime is 728637911. The reversal of 728637871 is 178736827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728637871 - 2¹ = 728637869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728637841) 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 in 3 ways as a sum of consecutive naturals, for example, 28024521 + ... + 28024546.

It is an arithmetic number, because the mean of its divisors is an integer number (196171738).

Almost surely, 2^728637871 is an apocalyptic number.

728637871 is a deficient number, since it is larger than the sum of its proper divisors (56049081).

728637871 is a wasteful number, since it uses less digits than its factorization.

728637871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56049080.

The product of its digits is 790272, while the sum is 49.

The square root of 728637871 is about 26993.2930743916. The cubic root of 728637871 is about 899.8509510375.

The spelling of 728637871 in words is "seven hundred twenty-eight million, six hundred thirty-seven thousand, eight hundred seventy-one".