1641305388 has 12 divisors (see below), whose sum is σ = 3829712600. Its totient is φ = 547101792.

The previous prime is 1641305387. The next prime is 1641305423. The reversal of 1641305388 is 8835031461.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1641305381) 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, 68387713 + ... + 68387736.

Almost surely, 2^1641305388 is an apocalyptic number.

It is an amenable number.

1641305388 is an abundant number, since it is smaller than the sum of its proper divisors (2188407212).

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

1641305388 is a wasteful number, since it uses less digits than its factorization.

1641305388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136775456 (or 136775454 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1641305388 is about 40513.0273862618. The cubic root of 1641305388 is about 1179.5865131744.

The spelling of 1641305388 in words is "one billion, six hundred forty-one million, three hundred five thousand, three hundred eighty-eight".