28711293 has 8 divisors (see below), whose sum is σ = 41226528. Its totient is φ = 17668464.

The previous prime is 28711289. The next prime is 28711307. The reversal of 28711293 is 39211782.

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

It is not a de Polignac number, because 28711293 - 2² = 28711289 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28711393) 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, 368055 + ... + 368132.

It is an arithmetic number, because the mean of its divisors is an integer number (5153316).

Almost surely, 2^28711293 is an apocalyptic number.

It is an amenable number.

28711293 is a deficient number, since it is larger than the sum of its proper divisors (12515235).

28711293 is a wasteful number, since it uses less digits than its factorization.

28711293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736203.

The product of its digits is 6048, while the sum is 33.

The square root of 28711293 is about 5358.2919853252. The cubic root of 28711293 is about 306.2087409084.

The spelling of 28711293 in words is "twenty-eight million, seven hundred eleven thousand, two hundred ninety-three".