844540008040 has 32 divisors (see below), whose sum is σ = 1912318312680. Its totient is φ = 335664306432.

The previous prime is 844540008019. The next prime is 844540008079. The reversal of 844540008040 is 40800045448.

It can be written as a sum of positive squares in 4 ways, for example, as 791327668356 + 53212339684 = 889566^2 + 230678^2 .

It is a super-3 number, since 3×844540008040³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67234167 + ... + 67246726.

Almost surely, 2^844540008040 is an apocalyptic number.

It is an amenable number.

844540008040 is an abundant number, since it is smaller than the sum of its proper divisors (1067778304640).

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

844540008040 is a wasteful number, since it uses less digits than its factorization.

844540008040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134481061 (or 134481057 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 37.

The spelling of 844540008040 in words is "eight hundred forty-four billion, five hundred forty million, eight thousand, forty".