7921152890 has 128 divisors (see below), whose sum is σ = 17579939328. Its totient is φ = 2508226560.

The previous prime is 7921152859. The next prime is 7921152913. The reversal of 7921152890 is 982511297.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18814880 + ... + 18815300.

It is an arithmetic number, because the mean of its divisors is an integer number (137343276).

Almost surely, 2^7921152890 is an apocalyptic number.

7921152890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

7921152890 is an abundant number, since it is smaller than the sum of its proper divisors (9658786438).

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

7921152890 is a wasteful number, since it uses less digits than its factorization.

7921152890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 7921152890 is about 89000.8589284396. The cubic root of 7921152890 is about 1993.4077021789.

The spelling of 7921152890 in words is "seven billion, nine hundred twenty-one million, one hundred fifty-two thousand, eight hundred ninety".