8215428 has 36 divisors (see below), whose sum is σ = 20762448. Its totient is φ = 2527200.

The previous prime is 8215411. The next prime is 8215453. The reversal of 8215428 is 8245128.

It is a junction number, because it is equal to n+sod(n) for n = 8215395 and 8215404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3 + ... + 4053.

Almost surely, 2^8215428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8215428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10381224).

8215428 is an abundant number, since it is smaller than the sum of its proper divisors (12547020).

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

8215428 is a wasteful number, since it uses less digits than its factorization.

8215428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4084 (or 4069 counting only the distinct ones).

The product of its digits is 5120, while the sum is 30.

The square root of 8215428 is about 2866.2567924036. The cubic root of 8215428 is about 201.7793558502.

The spelling of 8215428 in words is "eight million, two hundred fifteen thousand, four hundred twenty-eight".