840020560 has 40 divisors (see below), whose sum is σ = 1957899240. Its totient is φ = 335173632.

The previous prime is 840020549. The next prime is 840020581. The reversal of 840020560 is 65020048.

It can be written as a sum of positive squares in 4 ways, for example, as 396328464 + 443692096 = 19908^2 + 21064^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19884 + ... + 45556.

It is an arithmetic number, because the mean of its divisors is an integer number (48947481).

Almost surely, 2^840020560 is an apocalyptic number.

840020560 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

840020560 is an abundant number, since it is smaller than the sum of its proper divisors (1117878680).

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

840020560 is a wasteful number, since it uses less digits than its factorization.

840020560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26095 (or 26089 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 840020560 is about 28983.1081839060. The cubic root of 840020560 is about 943.5464940789.

The spelling of 840020560 in words is "eight hundred forty million, twenty thousand, five hundred sixty".