8321428 has 6 divisors (see below), whose sum is σ = 14562506. Its totient is φ = 4160712.

The previous prime is 8321393. The next prime is 8321429. The reversal of 8321428 is 8241238.

It can be written as a sum of positive squares in only one way, i.e., 5438224 + 2883204 = 2332^2 + 1698^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8321396 and 8321405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8321429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040175 + ... + 1040182.

Almost surely, 2^8321428 is an apocalyptic number.

It is an amenable number.

8321428 is a deficient number, since it is larger than the sum of its proper divisors (6241078).

8321428 is a wasteful number, since it uses less digits than its factorization.

8321428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080361 (or 2080359 counting only the distinct ones).

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

The square root of 8321428 is about 2884.6885447133. The cubic root of 8321428 is about 202.6434729825.

The spelling of 8321428 in words is "eight million, three hundred twenty-one thousand, four hundred twenty-eight".