7870785640 has 64 divisors (see below), whose sum is σ = 17951769360. Its totient is φ = 3105423360.

The previous prime is 7870785607. The next prime is 7870785677. The reversal of 7870785640 is 465870787.

It can be written as a sum of positive squares in 8 ways, for example, as 2633947684 + 5236837956 = 51322^2 + 72366^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1211200 + ... + 1217680.

Almost surely, 2^7870785640 is an apocalyptic number.

It is an amenable number.

7870785640 is an abundant number, since it is smaller than the sum of its proper divisors (10080983720).

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

7870785640 is a wasteful number, since it uses less digits than its factorization.

7870785640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6902 (or 6898 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 52.

The square root of 7870785640 is about 88717.4483402222. The cubic root of 7870785640 is about 1989.1736373492.

The spelling of 7870785640 in words is "seven billion, eight hundred seventy million, seven hundred eighty-five thousand, six hundred forty".