28515226 has 8 divisors (see below), whose sum is σ = 44152704. Its totient is φ = 13797660.

The previous prime is 28515217. The next prime is 28515247. The reversal of 28515226 is 62251582.

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

It is a super-2 number, since 2×28515226² = 1626236227662152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229900 + ... + 230023.

It is an arithmetic number, because the mean of its divisors is an integer number (5519088).

Almost surely, 2^28515226 is an apocalyptic number.

28515226 is a deficient number, since it is larger than the sum of its proper divisors (15637478).

28515226 is a wasteful number, since it uses less digits than its factorization.

28515226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459956.

The product of its digits is 9600, while the sum is 31.

The square root of 28515226 is about 5339.9649811586. The cubic root of 28515226 is about 305.5101236597.

The spelling of 28515226 in words is "twenty-eight million, five hundred fifteen thousand, two hundred twenty-six".