1020728869 has 2 divisors, whose sum is σ = 1020728870. Its totient is φ = 1020728868.

The previous prime is 1020728861. The next prime is 1020728893. The reversal of 1020728869 is 9688270201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1019971969 + 756900 = 31937^2 + 870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020728869 - 2³ = 1020728861 is a prime.

It is a super-2 number, since 2×1020728869² = 2083774848020038322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020728861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510364434 + 510364435.

It is an arithmetic number, because the mean of its divisors is an integer number (510364435).

Almost surely, 2^1020728869 is an apocalyptic number.

It is an amenable number.

1020728869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020728869 is an equidigital number, since it uses as much as digits as its factorization.

1020728869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1020728869 is about 31948.8476944005. The cubic root of 1020728869 is about 1006.8624224347.

The spelling of 1020728869 in words is "one billion, twenty million, seven hundred twenty-eight thousand, eight hundred sixty-nine".