7989425640 has 384 divisors, whose sum is σ = 30993580800. Its totient is φ = 1746800640.

The previous prime is 7989425593. The next prime is 7989425641. The reversal of 7989425640 is 465249897.

7989425640 is a `hidden beast` number, since 79 + 8 + 9 + 4 + 2 + 564 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (7989425641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5475231 + ... + 5476689.

It is an arithmetic number, because the mean of its divisors is an integer number (80712450).

Almost surely, 2^7989425640 is an apocalyptic number.

7989425640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7989425640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15496790400).

7989425640 is an abundant number, since it is smaller than the sum of its proper divisors (23004155160).

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

7989425640 is a wasteful number, since it uses less digits than its factorization.

7989425640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The square root of 7989425640 is about 89383.5870839832. The cubic root of 7989425640 is about 1999.1184147942.

The spelling of 7989425640 in words is "seven billion, nine hundred eighty-nine million, four hundred twenty-five thousand, six hundred forty".