840078276 has 12 divisors (see below), whose sum is σ = 1960182672. Its totient is φ = 280026088.

The previous prime is 840078271. The next prime is 840078287. The reversal of 840078276 is 672870048.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (840078271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35003250 + ... + 35003273.

It is an arithmetic number, because the mean of its divisors is an integer number (163348556).

Almost surely, 2^840078276 is an apocalyptic number.

It is an amenable number.

840078276 is an abundant number, since it is smaller than the sum of its proper divisors (1120104396).

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

840078276 is a wasteful number, since it uses less digits than its factorization.

840078276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70006530 (or 70006528 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 840078276 is about 28984.1038502142. The cubic root of 840078276 is about 943.5681032652.

The spelling of 840078276 in words is "eight hundred forty million, seventy-eight thousand, two hundred seventy-six".