1082638791 has 80 divisors (see below), whose sum is σ = 1869769440. Its totient is φ = 618658560.

The previous prime is 1082638771. The next prime is 1082638853. The reversal of 1082638791 is 1978362801.

1082638791 is a `hidden beast` number, since 1 + 0 + 8 + 2 + 638 + 7 + 9 + 1 = 666.

It is not a de Polignac number, because 1082638791 - 2⁷ = 1082638663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1082638721) 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 79 ways as a sum of consecutive naturals, for example, 1059861 + ... + 1060881.

It is an arithmetic number, because the mean of its divisors is an integer number (23372118).

Almost surely, 2^1082638791 is an apocalyptic number.

1082638791 is a deficient number, since it is larger than the sum of its proper divisors (787130649).

1082638791 is a wasteful number, since it uses less digits than its factorization.

1082638791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118 (or 1109 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1082638791 is about 32903.4768831502. The cubic root of 1082638791 is about 1026.8204937724.

The spelling of 1082638791 in words is "one billion, eighty-two million, six hundred thirty-eight thousand, seven hundred ninety-one".