1028363921 has 16 divisors (see below), whose sum is σ = 1133860560. Its totient is φ = 926899200.

The previous prime is 1028363909. The next prime is 1028363957. The reversal of 1028363921 is 1293638201.

It can be written as a sum of positive squares in 8 ways, for example, as 68293696 + 960070225 = 8264^2 + 30985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028363921 - 2²² = 1024169617 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028363981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90485 + ... + 101213.

It is an arithmetic number, because the mean of its divisors is an integer number (70866285).

Almost surely, 2^1028363921 is an apocalyptic number.

It is an amenable number.

1028363921 is a deficient number, since it is larger than the sum of its proper divisors (105496639).

1028363921 is a wasteful number, since it uses less digits than its factorization.

1028363921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10916.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1028363921 is about 32068.1137736537. The cubic root of 1028363921 is about 1009.3666326036.

The spelling of 1028363921 in words is "one billion, twenty-eight million, three hundred sixty-three thousand, nine hundred twenty-one".