28215043 has 4 divisors (see below), whose sum is σ = 29441808. Its totient is φ = 26988280.

The previous prime is 28215037. The next prime is 28215059. The reversal of 28215043 is 34051282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34051282 = 2 ⋅17025641.

It is a cyclic number.

It is not a de Polignac number, because 28215043 - 2²¹ = 26117891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28214999 and 28215017.

It is not an unprimeable number, because it can be changed into a prime (28215073) 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, 613348 + ... + 613393.

It is an arithmetic number, because the mean of its divisors is an integer number (7360452).

Almost surely, 2^28215043 is an apocalyptic number.

28215043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28215043 is a deficient number, since it is larger than the sum of its proper divisors (1226765).

28215043 is a wasteful number, since it uses less digits than its factorization.

28215043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226764.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28215043 is about 5311.7834104941. The cubic root of 28215043 is about 304.4342931429.

The spelling of 28215043 in words is "twenty-eight million, two hundred fifteen thousand, forty-three".