28621243 has 12 divisors (see below), whose sum is σ = 33673320. Its totient is φ = 24253152.

The previous prime is 28621237. The next prime is 28621249. The reversal of 28621243 is 34212682.

It is an interprime number because it is at equal distance from previous prime (28621237) and next prime (28621249).

It is not a de Polignac number, because 28621243 - 2⁵ = 28621211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28621249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1080 + ... + 7642.

It is an arithmetic number, because the mean of its divisors is an integer number (2806110).

Almost surely, 2^28621243 is an apocalyptic number.

28621243 is a deficient number, since it is larger than the sum of its proper divisors (5052077).

28621243 is an equidigital number, since it uses as much as digits as its factorization.

28621243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6666 (or 6659 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 28621243 is about 5349.8825220747. The cubic root of 28621243 is about 305.8882749600. Note that the first 3 decimals are identical.

The spelling of 28621243 in words is "twenty-eight million, six hundred twenty-one thousand, two hundred forty-three".