7857680 has 20 divisors (see below), whose sum is σ = 18269292. Its totient is φ = 3143040.

The previous prime is 7857673. The next prime is 7857683. The reversal of 7857680 is 867587.

It can be written as a sum of positive squares in 2 ways, for example, as 1547536 + 6310144 = 1244^2 + 2512^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (7857683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49031 + ... + 49190.

Almost surely, 2^7857680 is an apocalyptic number.

It is an amenable number.

7857680 is an abundant number, since it is smaller than the sum of its proper divisors (10411612).

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

7857680 is a wasteful number, since it uses less digits than its factorization.

7857680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98234 (or 98228 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 7857680 is about 2803.1553649414. The cubic root of 7857680 is about 198.8068966754.

The spelling of 7857680 in words is "seven million, eight hundred fifty-seven thousand, six hundred eighty".