728156871 has 40 divisors (see below), whose sum is σ = 1189011824. Its totient is φ = 441365760.

The previous prime is 728156851. The next prime is 728156899. The reversal of 728156871 is 178651827.

It is a happy number.

728156871 is a `hidden beast` number, since 7 + 2 + 81 + 568 + 7 + 1 = 666.

It is not a de Polignac number, because 728156871 - 2⁷ = 728156743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728156831) 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 39 ways as a sum of consecutive naturals, for example, 65391 + ... + 75711.

Almost surely, 2^728156871 is an apocalyptic number.

728156871 is a deficient number, since it is larger than the sum of its proper divisors (460854953).

728156871 is a wasteful number, since it uses less digits than its factorization.

728156871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10413 (or 10404 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The square root of 728156871 is about 26984.3819829175. The cubic root of 728156871 is about 899.6528994852.

The spelling of 728156871 in words is "seven hundred twenty-eight million, one hundred fifty-six thousand, eight hundred seventy-one".