7875638 has 4 divisors (see below), whose sum is σ = 11813460. Its totient is φ = 3937818.

The previous prime is 7875631. The next prime is 7875653. The reversal of 7875638 is 8365787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8365787 = 59 ⋅141793.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7875631) 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 as a sum of consecutive naturals, namely, 1968908 + ... + 1968911.

It is an arithmetic number, because the mean of its divisors is an integer number (2953365).

Almost surely, 2^7875638 is an apocalyptic number.

7875638 is a deficient number, since it is larger than the sum of its proper divisors (3937822).

7875638 is a wasteful number, since it uses less digits than its factorization.

7875638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937821.

The product of its digits is 282240, while the sum is 44.

The square root of 7875638 is about 2806.3567128931. The cubic root of 7875638 is about 198.9582330296.

The spelling of 7875638 in words is "seven million, eight hundred seventy-five thousand, six hundred thirty-eight".