7210640 has 40 divisors (see below), whose sum is σ = 16894008. Its totient is φ = 2862080.

The previous prime is 7210639. The next prime is 7210663. The reversal of 7210640 is 460127.

It can be written as a sum of positive squares in 4 ways, for example, as 1373584 + 5837056 = 1172^2 + 2416^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 13580 + ... + 14100.

Almost surely, 2^7210640 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 7210640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8447004).

7210640 is an abundant number, since it is smaller than the sum of its proper divisors (9683368).

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

7210640 is a wasteful number, since it uses less digits than its factorization.

7210640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 7210640 is about 2685.2634880026. The cubic root of 7210640 is about 193.1929486887.

Adding to 7210640 its reverse (460127), we get a palindrome (7670767).

The spelling of 7210640 in words is "seven million, two hundred ten thousand, six hundred forty".