8521428 has 12 divisors (see below), whose sum is σ = 19883360. Its totient is φ = 2840472.

The previous prime is 8521427. The next prime is 8521451. The reversal of 8521428 is 8241258.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×8521428² = 145229470318368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8521395 and 8521404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355048 + ... + 355071.

Almost surely, 2^8521428 is an apocalyptic number.

It is an amenable number.

8521428 is an abundant number, since it is smaller than the sum of its proper divisors (11361932).

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

8521428 is a wasteful number, since it uses less digits than its factorization.

8521428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710126 (or 710124 counting only the distinct ones).

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

The square root of 8521428 is about 2919.1485059859. The cubic root of 8521428 is about 204.2541047292.

The spelling of 8521428 in words is "eight million, five hundred twenty-one thousand, four hundred twenty-eight".