1640640333 has 16 divisors (see below), whose sum is σ = 2233506240. Its totient is φ = 1071001344.

The previous prime is 1640640319. The next prime is 1640640359. The reversal of 1640640333 is 3330460461.

1640640333 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1640640333 - 2⁹ = 1640639821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640640333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640640433) 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, 1018 + ... + 57291.

It is an arithmetic number, because the mean of its divisors is an integer number (139594140).

Almost surely, 2^1640640333 is an apocalyptic number.

It is an amenable number.

1640640333 is a deficient number, since it is larger than the sum of its proper divisors (592865907).

1640640333 is a wasteful number, since it uses less digits than its factorization.

1640640333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58508.

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 1640640333 is about 40504.8186392681. The cubic root of 1640640333 is about 1179.4271692976.

The spelling of 1640640333 in words is "one billion, six hundred forty million, six hundred forty thousand, three hundred thirty-three".