1640133528 has 64 divisors (see below), whose sum is σ = 4512758400. Its totient is φ = 492602880.

The previous prime is 1640133403. The next prime is 1640133533. The reversal of 1640133528 is 8253310461.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2343 + ... + 57321.

It is an arithmetic number, because the mean of its divisors is an integer number (70511850).

Almost surely, 2^1640133528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640133528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2256379200).

1640133528 is an abundant number, since it is smaller than the sum of its proper divisors (2872624872).

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

1640133528 is a wasteful number, since it uses less digits than its factorization.

1640133528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55112 (or 55108 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1640133528 is about 40498.5620485469. The cubic root of 1640133528 is about 1179.3057124222.

Adding to 1640133528 its reverse (8253310461), we get a palindrome (9893443989).

The spelling of 1640133528 in words is "one billion, six hundred forty million, one hundred thirty-three thousand, five hundred twenty-eight".