8213428 has 6 divisors (see below), whose sum is σ = 14373506. Its totient is φ = 4106712.

The previous prime is 8213423. The next prime is 8213437. The reversal of 8213428 is 8243128.

It can be written as a sum of positive squares in only one way, i.e., 8133904 + 79524 = 2852^2 + 282^2 .

It is a super-2 number, since 2×8213428² = 134920799022368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8213396 and 8213405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8213423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1026675 + ... + 1026682.

Almost surely, 2^8213428 is an apocalyptic number.

It is an amenable number.

8213428 is a deficient number, since it is larger than the sum of its proper divisors (6160078).

8213428 is a wasteful number, since it uses less digits than its factorization.

8213428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053361 (or 2053359 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 8213428 is about 2865.9078840744. The cubic root of 8213428 is about 201.7629805027.

The spelling of 8213428 in words is "eight million, two hundred thirteen thousand, four hundred twenty-eight".