728038381 has 8 divisors (see below), whose sum is σ = 854531840. Its totient is φ = 607166928.

The previous prime is 728038373. The next prime is 728038387. The reversal of 728038381 is 183830827.

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

It is a cyclic number.

It is not a de Polignac number, because 728038381 - 2³ = 728038373 is a prime.

It is a super-2 number, since 2×728038381² = 1060079768418202322, 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 (728038387) 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, 1405221 + ... + 1405738.

It is an arithmetic number, because the mean of its divisors is an integer number (106816480).

Almost surely, 2^728038381 is an apocalyptic number.

It is an amenable number.

728038381 is a deficient number, since it is larger than the sum of its proper divisors (126493459).

728038381 is a wasteful number, since it uses less digits than its factorization.

728038381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811003.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 728038381 is about 26982.1863643405. The cubic root of 728038381 is about 899.6040978881.

The spelling of 728038381 in words is "seven hundred twenty-eight million, thirty-eight thousand, three hundred eighty-one".