840774228 has 48 divisors (see below), whose sum is σ = 2244057984. Its totient is φ = 240007680.

The previous prime is 840774217. The next prime is 840774229. The reversal of 840774228 is 822477048.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 840774228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840774229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107176 + ... + 114752.

It is an arithmetic number, because the mean of its divisors is an integer number (46751208).

Almost surely, 2^840774228 is an apocalyptic number.

It is an amenable number.

840774228 is an abundant number, since it is smaller than the sum of its proper divisors (1403283756).

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

840774228 is a wasteful number, since it uses less digits than its factorization.

840774228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8912 (or 8910 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 42.

The square root of 840774228 is about 28996.1071180253. The cubic root of 840774228 is about 943.8285936155.

The spelling of 840774228 in words is "eight hundred forty million, seven hundred seventy-four thousand, two hundred twenty-eight".