7655640 has 64 divisors (see below), whose sum is σ = 23189760. Its totient is φ = 2021760.

The previous prime is 7655639. The next prime is 7655647. The reversal of 7655640 is 465567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7655647) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15477 + ... + 15963.

It is an arithmetic number, because the mean of its divisors is an integer number (362340).

Almost surely, 2^7655640 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 7655640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11594880).

7655640 is an abundant number, since it is smaller than the sum of its proper divisors (15534120).

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

7655640 is a wasteful number, since it uses less digits than its factorization.

7655640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 7655640 is about 2766.8827224875. The cubic root of 7655640 is about 197.0881445675.

The spelling of 7655640 in words is "seven million, six hundred fifty-five thousand, six hundred forty".