728043668 has 24 divisors (see below), whose sum is σ = 1395053184. Its totient is φ = 329702400.

The previous prime is 728043647. The next prime is 728043703. The reversal of 728043668 is 866340827.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18605 + ... + 42452.

It is an arithmetic number, because the mean of its divisors is an integer number (58127216).

Almost surely, 2^728043668 is an apocalyptic number.

It is an amenable number.

728043668 is a deficient number, since it is larger than the sum of its proper divisors (667009516).

728043668 is a wasteful number, since it uses less digits than its factorization.

728043668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61343 (or 61341 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 728043668 is about 26982.2843362085. The cubic root of 728043668 is about 899.6062755184.

The spelling of 728043668 in words is "seven hundred twenty-eight million, forty-three thousand, six hundred sixty-eight".