7213640 has 32 divisors (see below), whose sum is σ = 18550080. Its totient is φ = 2473152.

The previous prime is 7213639. The next prime is 7213667. The reversal of 7213640 is 463127.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12602 + ... + 13161.

It is an arithmetic number, because the mean of its divisors is an integer number (579690).

Almost surely, 2^7213640 is an apocalyptic number.

7213640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7213640 is an abundant number, since it is smaller than the sum of its proper divisors (11336440).

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

7213640 is a wasteful number, since it uses less digits than its factorization.

7213640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25781 (or 25777 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 7213640 is about 2685.8220343128. The cubic root of 7213640 is about 193.2197377340.

Adding to 7213640 its reverse (463127), we get a palindrome (7676767).

The spelling of 7213640 in words is "seven million, two hundred thirteen thousand, six hundred forty".