840067220 has 18 divisors (see below), whose sum is σ = 1764413406. Its totient is φ = 335975040.

The previous prime is 840067219. The next prime is 840067229. The reversal of 840067220 is 22760048.

It can be written as a sum of positive squares in 3 ways, for example, as 501580816 + 338486404 = 22396^2 + 18398^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840067229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 126380 + ... + 132860.

It is an arithmetic number, because the mean of its divisors is an integer number (98022967).

Almost surely, 2^840067220 is an apocalyptic number.

It is an amenable number.

840067220 is an abundant number, since it is smaller than the sum of its proper divisors (924346186).

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

840067220 is an frugal number, since it uses more digits than its factorization.

840067220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12971 (or 6488 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 840067220 is about 28983.9131243523. The cubic root of 840067220 is about 943.5639639149.

The spelling of 840067220 in words is "eight hundred forty million, sixty-seven thousand, two hundred twenty".