640115300 has 72 divisors (see below), whose sum is σ = 1581273792. Its totient is φ = 222640000.

The previous prime is 640115269. The next prime is 640115303. The reversal of 640115300 is 3511046.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (640115303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12650 + ... + 37950.

It is an arithmetic number, because the mean of its divisors is an integer number (21962136).

Almost surely, 2^640115300 is an apocalyptic number.

It is a pronic number, being equal to 25300×25301.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640115300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790636896).

640115300 is an abundant number, since it is smaller than the sum of its proper divisors (941158492).

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

640115300 is a wasteful number, since it uses less digits than its factorization.

640115300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25349 (or 25342 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 640115300 is about 25300.4999950594. The cubic root of 640115300 is about 861.8256242219.

Adding to 640115300 its reverse (3511046), we get a palindrome (643626346).

The spelling of 640115300 in words is "six hundred forty million, one hundred fifteen thousand, three hundred".