640787202 has 72 divisors (see below), whose sum is σ = 1533692160. Its totient is φ = 193208400.

The previous prime is 640787197. The next prime is 640787209. The reversal of 640787202 is 202787046.

640787202 is a `hidden beast` number, since 640 + 7 + 8 + 7 + 2 + 0 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (640787209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 519927 + ... + 521157.

It is an arithmetic number, because the mean of its divisors is an integer number (21301280).

Almost surely, 2^640787202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640787202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766846080).

640787202 is an abundant number, since it is smaller than the sum of its proper divisors (892904958).

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

640787202 is a wasteful number, since it uses less digits than its factorization.

640787202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500 (or 1486 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 640787202 is about 25313.7749456694. The cubic root of 640787202 is about 862.1270594336.

The spelling of 640787202 in words is "six hundred forty million, seven hundred eighty-seven thousand, two hundred two".