7800640 has 56 divisors (see below), whose sum is σ = 19568160. Its totient is φ = 2953728.

The previous prime is 7800629. The next prime is 7800647. The reversal of 7800640 is 460087.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7800647) 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, 5439 + ... + 6721.

Almost surely, 2^7800640 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 7800640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9784080).

7800640 is an abundant number, since it is smaller than the sum of its proper divisors (11767520).

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

7800640 is a wasteful number, since it uses less digits than its factorization.

7800640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 7800640 is about 2792.9625847834. The cubic root of 7800640 is about 198.3246722359.

The spelling of 7800640 in words is "seven million, eight hundred thousand, six hundred forty".