2018729640 has 64 divisors (see below), whose sum is σ = 6059318400. Its totient is φ = 538049792.

The previous prime is 2018729639. The next prime is 2018729681. The reversal of 2018729640 is 469278102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346189 + ... + 351971.

It is an arithmetic number, because the mean of its divisors is an integer number (94676850).

Almost surely, 2^2018729640 is an apocalyptic number.

2018729640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2018729640 is an abundant number, since it is smaller than the sum of its proper divisors (4040588760).

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

2018729640 is a wasteful number, since it uses less digits than its factorization.

2018729640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8706 (or 8702 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 2018729640 is about 44930.2753163165. The cubic root of 2018729640 is about 1263.8418141118.

The spelling of 2018729640 in words is "two billion, eighteen million, seven hundred twenty-nine thousand, six hundred forty".