82291228 has 6 divisors (see below), whose sum is σ = 144009656. Its totient is φ = 41145612.

The previous prime is 82291213. The next prime is 82291243. The reversal of 82291228 is 82219228.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (82291213) and next prime (82291243).

It is a junction number, because it is equal to n+sod(n) for n = 82291193 and 82291202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10286400 + ... + 10286407.

Almost surely, 2^82291228 is an apocalyptic number.

It is an amenable number.

82291228 is a deficient number, since it is larger than the sum of its proper divisors (61718428).

82291228 is a wasteful number, since it uses less digits than its factorization.

82291228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20572811 (or 20572809 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 82291228 is about 9071.4512620639. The cubic root of 82291228 is about 434.9618639223.

The spelling of 82291228 in words is "eighty-two million, two hundred ninety-one thousand, two hundred twenty-eight".