840137257680 has 320 divisors, whose sum is σ = 3107877273600. Its totient is φ = 187564737024.

The previous prime is 840137257651. The next prime is 840137257681. The reversal of 840137257680 is 86752731048.

It is a super-2 number, since 2×840137257680² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840137257681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3421089 + ... + 3658431.

It is an arithmetic number, because the mean of its divisors is an integer number (9712116480).

Almost surely, 2^840137257680 is an apocalyptic number.

840137257680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840137257680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553938636800).

840137257680 is an abundant number, since it is smaller than the sum of its proper divisors (2267740015920).

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

840137257680 is a wasteful number, since it uses less digits than its factorization.

840137257680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237423 (or 237403 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 840137257680 in words is "eight hundred forty billion, one hundred thirty-seven million, two hundred fifty-seven thousand, six hundred eighty".