728139877 has 2 divisors, whose sum is σ = 728139878. Its totient is φ = 728139876.

The previous prime is 728139871. The next prime is 728139899. The reversal of 728139877 is 778931827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692689761 + 35450116 = 26319^2 + 5954^2 .

It is a cyclic number.

It is not a de Polignac number, because 728139877 - 2¹⁵ = 728107109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728139871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364069938 + 364069939.

It is an arithmetic number, because the mean of its divisors is an integer number (364069939).

Almost surely, 2^728139877 is an apocalyptic number.

It is an amenable number.

728139877 is a deficient number, since it is larger than the sum of its proper divisors (1).

728139877 is an equidigital number, since it uses as much as digits as its factorization.

728139877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 52.

The square root of 728139877 is about 26984.0670952323. The cubic root of 728139877 is about 899.6459006178.

The spelling of 728139877 in words is "seven hundred twenty-eight million, one hundred thirty-nine thousand, eight hundred seventy-seven".