1640504432 has 20 divisors (see below), whose sum is σ = 3632545776. Its totient is φ = 703073280.

The previous prime is 1640504431. The next prime is 1640504443. The reversal of 1640504432 is 2344050461.

It is a junction number, because it is equal to n+sod(n) for n = 1640504395 and 1640504404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640504431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7323569 + ... + 7323792.

Almost surely, 2^1640504432 is an apocalyptic number.

It is an amenable number.

1640504432 is an abundant number, since it is smaller than the sum of its proper divisors (1992041344).

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

1640504432 is a wasteful number, since it uses less digits than its factorization.

1640504432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14647376 (or 14647370 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 1640504432 is about 40503.1410140004. The cubic root of 1640504432 is about 1179.3946027941.

Adding to 1640504432 its reverse (2344050461), we get a palindrome (3984554893).

The spelling of 1640504432 in words is "one billion, six hundred forty million, five hundred four thousand, four hundred thirty-two".