7989489756 has 60 divisors (see below), whose sum is σ = 21559876800. Its totient is φ = 2577251520.

The previous prime is 7989489749. The next prime is 7989489757. The reversal of 7989489756 is 6579849897.

7989489756 is a `hidden beast` number, since 7 + 98 + 9 + 489 + 7 + 56 = 666.

It is a super-2 number, since 2×7989489756² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7989489757) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 387681 + ... + 407768.

It is an arithmetic number, because the mean of its divisors is an integer number (359331280).

Almost surely, 2^7989489756 is an apocalyptic number.

It is an amenable number.

7989489756 is an abundant number, since it is smaller than the sum of its proper divisors (13570387044).

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

7989489756 is a wasteful number, since it uses less digits than its factorization.

7989489756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795496 (or 795485 counting only the distinct ones).

The product of its digits is 274337280, while the sum is 72.

The square root of 7989489756 is about 89383.9457397132. The cubic root of 7989489756 is about 1999.1237624933.

The spelling of 7989489756 in words is "seven billion, nine hundred eighty-nine million, four hundred eighty-nine thousand, seven hundred fifty-six".