7880640 has 56 divisors (see below), whose sum is σ = 25024080. Its totient is φ = 2101248.

The previous prime is 7880627. The next prime is 7880641. The reversal of 7880640 is 460887.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7880641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3145 + ... + 5064.

Almost surely, 2^7880640 is an apocalyptic number.

It is an amenable number.

7880640 is an abundant number, since it is smaller than the sum of its proper divisors (17143440).

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

7880640 is a wasteful number, since it uses less digits than its factorization.

7880640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8229 (or 8219 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 7880640 is about 2807.2477624891. The cubic root of 7880640 is about 199.0003451085. Note that the first 3 decimals are identical.

The spelling of 7880640 in words is "seven million, eight hundred eighty thousand, six hundred forty".