28993210 has 8 divisors (see below), whose sum is σ = 52187796. Its totient is φ = 11597280.

The previous prime is 28993207. The next prime is 28993213. The reversal of 28993210 is 1239982.

It is an interprime number because it is at equal distance from previous prime (28993207) and next prime (28993213).

It can be written as a sum of positive squares in 2 ways, for example, as 27279729 + 1713481 = 5223^2 + 1309^2 .

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

It is a super-2 number, since 2×28993210² = 1681212452208200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28993213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1449651 + ... + 1449670.

Almost surely, 2^28993210 is an apocalyptic number.

28993210 is a deficient number, since it is larger than the sum of its proper divisors (23194586).

28993210 is a wasteful number, since it uses less digits than its factorization.

28993210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2899328.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 28993210 is about 5384.5343345548. The cubic root of 28993210 is about 307.2077025001.

The spelling of 28993210 in words is "twenty-eight million, nine hundred ninety-three thousand, two hundred ten".