840075640 has 32 divisors (see below), whose sum is σ = 1900746000. Its totient is φ = 334150144.

The previous prime is 840075637. The next prime is 840075641. The reversal of 840075640 is 46570048.

It is a junction number, because it is equal to n+sod(n) for n = 840075596 and 840075605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840075641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51505 + ... + 65824.

Almost surely, 2^840075640 is an apocalyptic number.

It is an amenable number.

840075640 is an abundant number, since it is smaller than the sum of its proper divisors (1060670360).

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

840075640 is a wasteful number, since it uses less digits than its factorization.

840075640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117519 (or 117515 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 840075640 is about 28984.0583769768. The cubic root of 840075640 is about 943.5671163540.

The spelling of 840075640 in words is "eight hundred forty million, seventy-five thousand, six hundred forty".