7865028 has 36 divisors (see below), whose sum is σ = 19999980. Its totient is φ = 2606016.

The previous prime is 7865023. The next prime is 7865047. The reversal of 7865028 is 8205687.

It can be written as a sum of positive squares in 2 ways, for example, as 3873024 + 3992004 = 1968^2 + 1998^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7864983 and 7865001.

It is not an unprimeable number, because it can be changed into a prime (7865023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6538 + ... + 7646.

It is an arithmetic number, because the mean of its divisors is an integer number (555555).

Almost surely, 2^7865028 is an apocalyptic number.

It is an amenable number.

7865028 is an abundant number, since it is smaller than the sum of its proper divisors (12134952).

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

7865028 is a wasteful number, since it uses less digits than its factorization.

7865028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 7865028 is about 2804.4657245187. The cubic root of 7865028 is about 198.8688478686.

The spelling of 7865028 in words is "seven million, eight hundred sixty-five thousand, twenty-eight".