7991275450 has 24 divisors (see below), whose sum is σ = 14939241372. Its totient is φ = 3180280320.

The previous prime is 7991275427. The next prime is 7991275477. The reversal of 7991275450 is 545721997.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4922004649 + 3069270801 = 70157^2 + 55401^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7991275394 and 7991275403.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 395799 + ... + 415498.

Almost surely, 2^7991275450 is an apocalyptic number.

7991275450 is a deficient number, since it is larger than the sum of its proper divisors (6947965922).

7991275450 is a wasteful number, since it uses less digits than its factorization.

7991275450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811506 (or 811501 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 49.

The square root of 7991275450 is about 89393.9340783255. The cubic root of 7991275450 is about 1999.2726897086.

The spelling of 7991275450 in words is "seven billion, nine hundred ninety-one million, two hundred seventy-five thousand, four hundred fifty".