28893313 has 4 divisors (see below), whose sum is σ = 30149568. Its totient is φ = 27637060.

The previous prime is 28893307. The next prime is 28893323. The reversal of 28893313 is 31339882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28893313 is a prime.

It is a super-2 number, since 2×28893313² = 1669647072231938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28893323) 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, 628093 + ... + 628138.

It is an arithmetic number, because the mean of its divisors is an integer number (7537392).

Almost surely, 2^28893313 is an apocalyptic number.

28893313 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28893313 is a deficient number, since it is larger than the sum of its proper divisors (1256255).

28893313 is a wasteful number, since it uses less digits than its factorization.

28893313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256254.

The product of its digits is 31104, while the sum is 37.

The square root of 28893313 is about 5375.2500406958. The cubic root of 28893313 is about 306.8544652851.

The spelling of 28893313 in words is "twenty-eight million, eight hundred ninety-three thousand, three hundred thirteen".