70782391805 has 18 divisors (see below), whose sum is σ = 86991569406. Its totient is φ = 55289042928.

The previous prime is 70782391793. The next prime is 70782391807. The reversal of 70782391805 is 50819328707.

It can be written as a sum of positive squares in only one way, i.e., 56625913444 + 14156478361 = 237962^2 + 118981^2 .

It is not a de Polignac number, because 70782391805 - 2⁸ = 70782391549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70782391807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25579532 + ... + 25582298.

It is an arithmetic number, because the mean of its divisors is an integer number (4832864967).

Almost surely, 2^70782391805 is an apocalyptic number.

It is an amenable number.

70782391805 is a deficient number, since it is larger than the sum of its proper divisors (16209177601).

70782391805 is an frugal number, since it uses more digits than its factorization.

70782391805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5625 (or 2815 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 70782391805 in words is "seventy billion, seven hundred eighty-two million, three hundred ninety-one thousand, eight hundred five".