7875982644 has 36 divisors (see below), whose sum is σ = 19211060736. Its totient is φ = 2511180848.

The previous prime is 7875982613. The next prime is 7875982651. The reversal of 7875982644 is 4462895787.

It is a happy number.

It is a super-2 number, since 2×7875982644² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 614004 + ... + 626699.

It is an arithmetic number, because the mean of its divisors is an integer number (533640576).

Almost surely, 2^7875982644 is an apocalyptic number.

It is an amenable number.

7875982644 is an abundant number, since it is smaller than the sum of its proper divisors (11335078092).

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

7875982644 is a wasteful number, since it uses less digits than its factorization.

7875982644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240756 (or 1240731 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 60.

The square root of 7875982644 is about 88746.7331455080. The cubic root of 7875982644 is about 1989.6113517592.

The spelling of 7875982644 in words is "seven billion, eight hundred seventy-five million, nine hundred eighty-two thousand, six hundred forty-four".