17878689140 has 72 divisors (see below), whose sum is σ = 40801346208. Its totient is φ = 6577683840.

The previous prime is 17878689137. The next prime is 17878689161. The reversal of 17878689140 is 4198687871.

It is a self number, because there is not a number n which added to its sum of digits gives 17878689140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 947195 + ... + 965885.

It is an arithmetic number, because the mean of its divisors is an integer number (566685364).

Almost surely, 2^17878689140 is an apocalyptic number.

17878689140 is a gapful number since it is divisible by the number (10) 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 17878689140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20400673104).

17878689140 is an abundant number, since it is smaller than the sum of its proper divisors (22922657068).

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

17878689140 is a wasteful number, since it uses less digits than its factorization.

17878689140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19009 (or 18994 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 17878689140 in words is "seventeen billion, eight hundred seventy-eight million, six hundred eighty-nine thousand, one hundred forty".