1640200536 has 256 divisors, whose sum is σ = 5249664000. Its totient is φ = 470292480.

The previous prime is 1640200489. The next prime is 1640200543. The reversal of 1640200536 is 6350020461.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3787776 + ... + 3788208.

It is an arithmetic number, because the mean of its divisors is an integer number (20506500).

Almost surely, 2^1640200536 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 1640200536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2624832000).

1640200536 is an abundant number, since it is smaller than the sum of its proper divisors (3609463464).

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

1640200536 is a wasteful number, since it uses less digits than its factorization.

1640200536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1640200536 is about 40499.3893287294. The cubic root of 1640200536 is about 1179.3217724644.

Adding to 1640200536 its reverse (6350020461), we get a palindrome (7990220997).

The spelling of 1640200536 in words is "one billion, six hundred forty million, two hundred thousand, five hundred thirty-six".