1028630213 has 8 divisors (see below), whose sum is σ = 1108004856. Its totient is φ = 949291200.

The previous prime is 1028630191. The next prime is 1028630221. The reversal of 1028630213 is 3120368201.

It can be written as a sum of positive squares in 4 ways, for example, as 3541924 + 1025088289 = 1882^2 + 32017^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1028630213 - 2⁸ = 1028629957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028630243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106943 + ... + 116163.

It is an arithmetic number, because the mean of its divisors is an integer number (138500607).

Almost surely, 2^1028630213 is an apocalyptic number.

1028630213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1028630213 is a deficient number, since it is larger than the sum of its proper divisors (79374643).

1028630213 is an equidigital number, since it uses as much as digits as its factorization.

1028630213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17815.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1028630213 is about 32072.2654796944. The cubic root of 1028630213 is about 1009.4537493193.

Adding to 1028630213 its reverse (3120368201), we get a palindrome (4148998414).

The spelling of 1028630213 in words is "one billion, twenty-eight million, six hundred thirty thousand, two hundred thirteen".