640116136 has 48 divisors (see below), whose sum is σ = 1326276000. Its totient is φ = 289412640.

The previous prime is 640116133. The next prime is 640116163. The reversal of 640116136 is 631611046.

It is not an unprimeable number, because it can be changed into a prime (640116133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190971 + ... + 194293.

It is an arithmetic number, because the mean of its divisors is an integer number (27630750).

Almost surely, 2^640116136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640116136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (663138000).

640116136 is an abundant number, since it is smaller than the sum of its proper divisors (686159864).

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

640116136 is a wasteful number, since it uses less digits than its factorization.

640116136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3550 (or 3535 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 640116136 is about 25300.5165164666. The cubic root of 640116136 is about 861.8259994074.

The spelling of 640116136 in words is "six hundred forty million, one hundred sixteen thousand, one hundred thirty-six".