7638887 has 4 divisors (see below), whose sum is σ = 7649736. Its totient is φ = 7628040.

The previous prime is 7638881. The next prime is 7638889. The reversal of 7638887 is 7888367.

7638887 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7638887 - 2⁶ = 7638823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7638881) 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, 4289 + ... + 5802.

It is an arithmetic number, because the mean of its divisors is an integer number (1912434).

Almost surely, 2^7638887 is an apocalyptic number.

7638887 is a deficient number, since it is larger than the sum of its proper divisors (10849).

7638887 is a wasteful number, since it uses less digits than its factorization.

7638887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10848.

The product of its digits is 451584, while the sum is 47.

The square root of 7638887 is about 2763.8536502500. The cubic root of 7638887 is about 196.9442755116.

The spelling of 7638887 in words is "seven million, six hundred thirty-eight thousand, eight hundred eighty-seven".