728476981 has 2 divisors, whose sum is σ = 728476982. Its totient is φ = 728476980.

The previous prime is 728476963. The next prime is 728477003. The reversal of 728476981 is 189674827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532224900 + 196252081 = 23070^2 + 14009^2 .

It is a cyclic number.

It is not a de Polignac number, because 728476981 - 2⁵ = 728476949 is a prime.

It is a super-2 number, since 2×728476981² = 1061357423693748722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728476901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364238490 + 364238491.

It is an arithmetic number, because the mean of its divisors is an integer number (364238491).

Almost surely, 2^728476981 is an apocalyptic number.

It is an amenable number.

728476981 is a deficient number, since it is larger than the sum of its proper divisors (1).

728476981 is an equidigital number, since it uses as much as digits as its factorization.

728476981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 52.

The square root of 728476981 is about 26990.3127251242. The cubic root of 728476981 is about 899.7847143500.

The spelling of 728476981 in words is "seven hundred twenty-eight million, four hundred seventy-six thousand, nine hundred eighty-one".