640782382 has 8 divisors (see below), whose sum is σ = 961324416. Its totient is φ = 320340912.

The previous prime is 640782379. The next prime is 640782403. The reversal of 640782382 is 283287046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×640782382² = 821204122163187848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6423 + ... + 36370.

It is an arithmetic number, because the mean of its divisors is an integer number (120165552).

Almost surely, 2^640782382 is an apocalyptic number.

640782382 is a deficient number, since it is larger than the sum of its proper divisors (320542034).

640782382 is a wasteful number, since it uses less digits than its factorization.

640782382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50282.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 640782382 is about 25313.6797404091. The cubic root of 640782382 is about 862.1248977888.

The spelling of 640782382 in words is "six hundred forty million, seven hundred eighty-two thousand, three hundred eighty-two".