7021428 has 12 divisors (see below), whose sum is σ = 16383360. Its totient is φ = 2340472.

The previous prime is 7021423. The next prime is 7021433. The reversal of 7021428 is 8241207.

7021428 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7021423) and next prime (7021433).

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

It is a junction number, because it is equal to n+sod(n) for n = 7021398 and 7021407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7021423) 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, 292548 + ... + 292571.

It is an arithmetic number, because the mean of its divisors is an integer number (1365280).

Almost surely, 2^7021428 is an apocalyptic number.

It is an amenable number.

7021428 is an abundant number, since it is smaller than the sum of its proper divisors (9361932).

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

7021428 is a wasteful number, since it uses less digits than its factorization.

7021428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585126 (or 585124 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 7021428 is about 2649.7977281295. The cubic root of 7021428 is about 191.4881112994.

The spelling of 7021428 in words is "seven million, twenty-one thousand, four hundred twenty-eight".