7931660 has 48 divisors (see below), whose sum is σ = 18772992. Its totient is φ = 2788800.

The previous prime is 7931659. The next prime is 7931699. The reversal of 7931660 is 661397.

It is a super-2 number, since 2×7931660² = 125822460711200, which contains 22 as substring.

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, 6239 + ... + 7401.

It is an arithmetic number, because the mean of its divisors is an integer number (391104).

Almost surely, 2^7931660 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 7931660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9386496).

7931660 is an abundant number, since it is smaller than the sum of its proper divisors (10841332).

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

7931660 is a wasteful number, since it uses less digits than its factorization.

7931660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214 (or 1212 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 7931660 is about 2816.3202942847. The cubic root of 7931660 is about 199.4288706086.

The spelling of 7931660 in words is "seven million, nine hundred thirty-one thousand, six hundred sixty".