7212640 has 48 divisors (see below), whose sum is σ = 17342640. Its totient is φ = 2833920.

The previous prime is 7212637. The next prime is 7212661. The reversal of 7212640 is 462127.

It is a congruent number.

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, 9391 + ... + 10129.

It is an arithmetic number, because the mean of its divisors is an integer number (361305).

Almost surely, 2^7212640 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 7212640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8671320).

7212640 is an abundant number, since it is smaller than the sum of its proper divisors (10130000).

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

7212640 is a wasteful number, since it uses less digits than its factorization.

7212640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 807 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 7212640 is about 2685.6358651165. The cubic root of 7212640 is about 193.2108088776.

Adding to 7212640 its reverse (462127), we get a palindrome (7674767).

The spelling of 7212640 in words is "seven million, two hundred twelve thousand, six hundred forty".