7828891660 has 24 divisors (see below), whose sum is σ = 16453540656. Its totient is φ = 3129105600.

The previous prime is 7828891619. The next prime is 7828891667. The reversal of 7828891660 is 661988287.

It is a super-2 number, since 2×7828891660² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7828891667) 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, 126891 + ... + 178210.

It is an arithmetic number, because the mean of its divisors is an integer number (685564194).

Almost surely, 2^7828891660 is an apocalyptic number.

It is an amenable number.

7828891660 is an abundant number, since it is smaller than the sum of its proper divisors (8624648996).

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

7828891660 is a wasteful number, since it uses less digits than its factorization.

7828891660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306393 (or 306391 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 55.

The square root of 7828891660 is about 88481.0242933478. The cubic root of 7828891660 is about 1985.6380862462.

The spelling of 7828891660 in words is "seven billion, eight hundred twenty-eight million, eight hundred ninety-one thousand, six hundred sixty".