1640353536 has 54 divisors (see below), whose sum is σ = 4729550280. Its totient is φ = 546783744.

The previous prime is 1640353531. The next prime is 1640353567. The reversal of 1640353536 is 6353530461.

1640353536 is a `hidden beast` number, since 1 + 640 + 3 + 5 + 3 + 5 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1640353536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640353531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 353676 + ... + 358283.

Almost surely, 2^1640353536 is an apocalyptic number.

1640353536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1640353536 is an abundant number, since it is smaller than the sum of its proper divisors (3089196744).

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

1640353536 is an equidigital number, since it uses as much as digits as its factorization.

1640353536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711981 (or 711964 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The square root of 1640353536 is about 40501.2782020518. The cubic root of 1640353536 is about 1179.3584408711.

Adding to 1640353536 its reverse (6353530461), we get a palindrome (7993883997).

The spelling of 1640353536 in words is "one billion, six hundred forty million, three hundred fifty-three thousand, five hundred thirty-six".