2001133640 has 64 divisors (see below), whose sum is σ = 4917309120. Its totient is φ = 726880000.

The previous prime is 2001133633. The next prime is 2001133643. The reversal of 2001133640 is 463311002.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (2001133643) 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, 517715 + ... + 521565.

It is an arithmetic number, because the mean of its divisors is an integer number (76832955).

Almost surely, 2^2001133640 is an apocalyptic number.

2001133640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001133640 is an abundant number, since it is smaller than the sum of its proper divisors (2916175480).

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

2001133640 is a wasteful number, since it uses less digits than its factorization.

2001133640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054 (or 5050 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 2001133640 is about 44734.0322349774. The cubic root of 2001133640 is about 1260.1590544151.

Adding to 2001133640 its reverse (463311002), we get a palindrome (2464444642).

The spelling of 2001133640 in words is "two billion, one million, one hundred thirty-three thousand, six hundred forty".