7821890632 has 16 divisors (see below), whose sum is σ = 14703752700. Its totient is φ = 3900889920.

The previous prime is 7821890591. The next prime is 7821890641. The reversal of 7821890632 is 2360981287.

It can be written as a sum of positive squares in 2 ways, for example, as 7672708836 + 149181796 = 87594^2 + 12214^2 .

It is a super-2 number, since 2×7821890632² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1253619 + ... + 1259842.

Almost surely, 2^7821890632 is an apocalyptic number.

It is an amenable number.

7821890632 is a deficient number, since it is larger than the sum of its proper divisors (6881862068).

7821890632 is a wasteful number, since it uses less digits than its factorization.

7821890632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513856 (or 2513852 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 7821890632 is about 88441.4531314361. The cubic root of 7821890632 is about 1985.0460205858.

The spelling of 7821890632 in words is "seven billion, eight hundred twenty-one million, eight hundred ninety thousand, six hundred thirty-two".