640852450 has 48 divisors (see below), whose sum is σ = 1421516160. Its totient is φ = 210165120.

The previous prime is 640852423. The next prime is 640852453. The reversal of 640852450 is 54258046.

It is not an unprimeable number, because it can be changed into a prime (640852453) 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, 31755 + ... + 47854.

It is an arithmetic number, because the mean of its divisors is an integer number (29614920).

Almost surely, 2^640852450 is an apocalyptic number.

640852450 is an abundant number, since it is smaller than the sum of its proper divisors (780663710).

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

640852450 is a wasteful number, since it uses less digits than its factorization.

640852450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79651 (or 79646 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 640852450 is about 25315.0636973325. The cubic root of 640852450 is about 862.1563203994.

The spelling of 640852450 in words is "six hundred forty million, eight hundred fifty-two thousand, four hundred fifty".