728254381 has 4 divisors (see below), whose sum is σ = 771092892. Its totient is φ = 685415872.

The previous prime is 728254379. The next prime is 728254441. The reversal of 728254381 is 183452827.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 662238756 + 66015625 = 25734^2 + 8125^2 .

It is a cyclic number.

It is not a de Polignac number, because 728254381 - 2¹ = 728254379 is a prime.

It is a super-2 number, since 2×728254381² = 1060708886891386322, 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 (728254301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21419230 + ... + 21419263.

It is an arithmetic number, because the mean of its divisors is an integer number (192773223).

Almost surely, 2^728254381 is an apocalyptic number.

It is an amenable number.

728254381 is a deficient number, since it is larger than the sum of its proper divisors (42838511).

728254381 is a wasteful number, since it uses less digits than its factorization.

728254381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42838510.

The product of its digits is 107520, while the sum is 40.

The square root of 728254381 is about 26986.1887083004. The cubic root of 728254381 is about 899.6930562345.

The spelling of 728254381 in words is "seven hundred twenty-eight million, two hundred fifty-four thousand, three hundred eighty-one".