7985640 has 64 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 1965312.

The previous prime is 7985617. The next prime is 7985641. The reversal of 7985640 is 465897.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (7985641) 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, 1000 + ... + 4119.

It is an arithmetic number, because the mean of its divisors is an integer number (403200).

Almost surely, 2^7985640 is an apocalyptic number.

It is an amenable number.

7985640 is an abundant number, since it is smaller than the sum of its proper divisors (17819160).

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

7985640 is a wasteful number, since it uses less digits than its factorization.

7985640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5146 (or 5142 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 7985640 is about 2825.8874712203. The cubic root of 7985640 is about 199.8802616613.

The spelling of 7985640 in words is "seven million, nine hundred eighty-five thousand, six hundred forty".