728323871 has 8 divisors (see below), whose sum is σ = 797250384. Its totient is φ = 659849920.

The previous prime is 728323861. The next prime is 728323879. The reversal of 728323871 is 178323827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728323871 is a prime.

It is a super-2 number, since 2×728323871² = 1060911322136849282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728323879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109766 + ... + 116211.

It is an arithmetic number, because the mean of its divisors is an integer number (99656298).

Almost surely, 2^728323871 is an apocalyptic number.

728323871 is a deficient number, since it is larger than the sum of its proper divisors (68926513).

728323871 is a wasteful number, since it uses less digits than its factorization.

728323871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226281.

The product of its digits is 112896, while the sum is 41.

The square root of 728323871 is about 26987.4761880395. The cubic root of 728323871 is about 899.7216715479.

The spelling of 728323871 in words is "seven hundred twenty-eight million, three hundred twenty-three thousand, eight hundred seventy-one".