1640133628 has 24 divisors (see below), whose sum is σ = 3393381600. Its totient is φ = 678675648.

The previous prime is 1640133623. The next prime is 1640133631. The reversal of 1640133628 is 8263310461.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1640133593 and 1640133602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640133623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009123 + ... + 1010746.

It is an arithmetic number, because the mean of its divisors is an integer number (141390900).

Almost surely, 2^1640133628 is an apocalyptic number.

It is an amenable number.

1640133628 is an abundant number, since it is smaller than the sum of its proper divisors (1753247972).

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

1640133628 is a wasteful number, since it uses less digits than its factorization.

1640133628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019909 (or 2019907 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1640133628 is about 40498.5632831586. The cubic root of 1640133628 is about 1179.3057363899.

The spelling of 1640133628 in words is "one billion, six hundred forty million, one hundred thirty-three thousand, six hundred twenty-eight".