7645428 has 60 divisors (see below), whose sum is σ = 22848672. Its totient is φ = 2183760.

The previous prime is 7645423. The next prime is 7645433. The reversal of 7645428 is 8245467.

7645428 is a `hidden beast` number, since 7 + 645 + 4 + 2 + 8 = 666.

7645428 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 (7645423) and next prime (7645433).

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 = 7645392 and 7645401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7645423) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 583 + ... + 3953.

Almost surely, 2^7645428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7645428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11424336).

7645428 is an abundant number, since it is smaller than the sum of its proper divisors (15203244).

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

7645428 is a wasteful number, since it uses less digits than its factorization.

7645428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394 (or 3383 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 7645428 is about 2765.0367086171. The cubic root of 7645428 is about 197.0004723979. Note that the first 3 decimals are identical.

The spelling of 7645428 in words is "seven million, six hundred forty-five thousand, four hundred twenty-eight".