7138664 has 32 divisors (see below), whose sum is σ = 14605920. Its totient is φ = 3251136.

The previous prime is 7138643. The next prime is 7138673. The reversal of 7138664 is 4668317.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8219 + ... + 9045.

It is an arithmetic number, because the mean of its divisors is an integer number (456435).

Almost surely, 2^7138664 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 7138664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7302960).

7138664 is an abundant number, since it is smaller than the sum of its proper divisors (7467256).

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

7138664 is a wasteful number, since it uses less digits than its factorization.

7138664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 925 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 7138664 is about 2671.8278387651. The cubic root of 7138664 is about 192.5479860132.

The spelling of 7138664 in words is "seven million, one hundred thirty-eight thousand, six hundred sixty-four".