1640232735 has 12 divisors (see below), whose sum is σ = 2624623368. Its totient is φ = 874707136.

The previous prime is 1640232719. The next prime is 1640232761. The reversal of 1640232735 is 5372320461.

It is not a de Polignac number, because 1640232735 - 2⁴ = 1640232719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640232696 and 1640232705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151627 + ... + 162083.

It is an arithmetic number, because the mean of its divisors is an integer number (218718614).

Almost surely, 2^1640232735 is an apocalyptic number.

1640232735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1640232735 is a deficient number, since it is larger than the sum of its proper divisors (984390633).

1640232735 is an frugal number, since it uses more digits than its factorization.

1640232735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20922 (or 10465 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 1640232735 is about 40499.7868512910. The cubic root of 1640232735 is about 1179.3294895560.

The spelling of 1640232735 in words is "one billion, six hundred forty million, two hundred thirty-two thousand, seven hundred thirty-five".