7206640 has 80 divisors (see below), whose sum is σ = 20302272. Its totient is φ = 2322432.

The previous prime is 7206631. The next prime is 7206649. The reversal of 7206640 is 466027.

7206640 = T₁₅ + T₁₆ + ... + T₃₅₀.

It is an interprime number because it is at equal distance from previous prime (7206631) and next prime (7206649).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7206649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9142 + ... + 9898.

Almost surely, 2^7206640 is an apocalyptic number.

7206640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7206640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10151136).

7206640 is an abundant number, since it is smaller than the sum of its proper divisors (13095632).

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

7206640 is a wasteful number, since it uses less digits than its factorization.

7206640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 7206640 is about 2684.5185788145. The cubic root of 7206640 is about 193.1572184006.

The spelling of 7206640 in words is "seven million, two hundred six thousand, six hundred forty".