28319226 has 16 divisors (see below), whose sum is σ = 60995424. Its totient is φ = 8713584.

The previous prime is 28319191. The next prime is 28319231. The reversal of 28319226 is 62291382.

It is a happy number.

It is a super-2 number, since 2×28319226² = 1603957122478152, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181456 + ... + 181611.

It is an arithmetic number, because the mean of its divisors is an integer number (3812214).

Almost surely, 2^28319226 is an apocalyptic number.

28319226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28319226 is an abundant number, since it is smaller than the sum of its proper divisors (32676198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28319226 is a wasteful number, since it uses less digits than its factorization.

28319226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363085.

The product of its digits is 10368, while the sum is 33.

The square root of 28319226 is about 5321.5811560099. The cubic root of 28319226 is about 304.8085370057.

The spelling of 28319226 in words is "twenty-eight million, three hundred nineteen thousand, two hundred twenty-six".