7428643 has 4 divisors (see below), whose sum is σ = 7865640. Its totient is φ = 6991648.

The previous prime is 7428599. The next prime is 7428649. The reversal of 7428643 is 3468247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3468247 = 443 ⋅7829.

It is a cyclic number.

It is not a de Polignac number, because 7428643 - 2¹⁷ = 7297571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7428599 and 7428608.

It is not an unprimeable number, because it can be changed into a prime (7428649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218473 + ... + 218506.

It is an arithmetic number, because the mean of its divisors is an integer number (1966410).

Almost surely, 2^7428643 is an apocalyptic number.

7428643 is a deficient number, since it is larger than the sum of its proper divisors (436997).

7428643 is a wasteful number, since it uses less digits than its factorization.

7428643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436996.

The product of its digits is 32256, while the sum is 34.

The square root of 7428643 is about 2725.5537052129. The cubic root of 7428643 is about 195.1206179029.

The spelling of 7428643 in words is "seven million, four hundred twenty-eight thousand, six hundred forty-three".