1020728893 has 2 divisors, whose sum is σ = 1020728894. Its totient is φ = 1020728892.

The previous prime is 1020728869. The next prime is 1020728897. The reversal of 1020728893 is 3988270201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 892993689 + 127735204 = 29883^2 + 11302^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020728893 - 2⁵ = 1020728861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020728897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510364446 + 510364447.

It is an arithmetic number, because the mean of its divisors is an integer number (510364447).

Almost surely, 2^1020728893 is an apocalyptic number.

It is an amenable number.

1020728893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020728893 is an equidigital number, since it uses as much as digits as its factorization.

1020728893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1020728893 is about 31948.8480700009. The cubic root of 1020728893 is about 1006.8624303260.

The spelling of 1020728893 in words is "one billion, twenty million, seven hundred twenty-eight thousand, eight hundred ninety-three".