640470950436 has 48 divisors (see below), whose sum is σ = 1496869438400. Its totient is φ = 213142430592.

The previous prime is 640470950389. The next prime is 640470950437. The reversal of 640470950436 is 634059074046.

It is not an unprimeable number, because it can be changed into a prime (640470950437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19119510 + ... + 19152978.

Almost surely, 2^640470950436 is an apocalyptic number.

It is an amenable number.

640470950436 is an abundant number, since it is smaller than the sum of its proper divisors (856398487964).

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

640470950436 is a wasteful number, since it uses less digits than its factorization.

640470950436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36028 (or 36026 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 48.

The spelling of 640470950436 in words is "six hundred forty billion, four hundred seventy million, nine hundred fifty thousand, four hundred thirty-six".