7921087650 has 576 divisors, whose sum is σ = 27197664000. Its totient is φ = 1646023680.

The previous prime is 7921087591. The next prime is 7921087651. The reversal of 7921087650 is 567801297.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7921087596 and 7921087605.

It is not an unprimeable number, because it can be changed into a prime (7921087651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 108508014 + ... + 108508086.

Almost surely, 2^7921087650 is an apocalyptic number.

7921087650 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7921087650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13598832000).

7921087650 is an abundant number, since it is smaller than the sum of its proper divisors (19276576350).

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

7921087650 is a wasteful number, since it uses less digits than its factorization.

7921087650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 7921087650 is about 89000.4924143681. The cubic root of 7921087650 is about 1993.4022294791.

The spelling of 7921087650 in words is "seven billion, nine hundred twenty-one million, eighty-seven thousand, six hundred fifty".