7001640 has 80 divisors (see below), whose sum is σ = 23544180. Its totient is φ = 1866240.

The previous prime is 7001639. The next prime is 7001653. The reversal of 7001640 is 461007.

It can be written as a sum of positive squares in 2 ways, for example, as 7001316 + 324 = 2646^2 + 18^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2160 + ... + 4320.

Almost surely, 2^7001640 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 7001640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11772090).

7001640 is an abundant number, since it is smaller than the sum of its proper divisors (16542540).

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

7001640 is a wasteful number, since it uses less digits than its factorization.

7001640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184 (or 2171 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 7001640 is about 2646.0612237815. The cubic root of 7001640 is about 191.3080561923.

Adding to 7001640 its reverse (461007), we get a palindrome (7462647).

The spelling of 7001640 in words is "seven million, one thousand, six hundred forty".