840078028 has 12 divisors (see below), whose sum is σ = 1505993832. Its totient is φ = 409794080.

The previous prime is 840078017. The next prime is 840078067. The reversal of 840078028 is 820870048.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561050 + ... + 2561377.

It is an arithmetic number, because the mean of its divisors is an integer number (125499486).

Almost surely, 2^840078028 is an apocalyptic number.

It is an amenable number.

840078028 is a deficient number, since it is larger than the sum of its proper divisors (665915804).

840078028 is a wasteful number, since it uses less digits than its factorization.

840078028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5122472 (or 5122470 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 840078028 is about 28984.0995720067. The cubic root of 840078028 is about 943.5680104148.

The spelling of 840078028 in words is "eight hundred forty million, seventy-eight thousand, twenty-eight".