1640908605 has 64 divisors (see below), whose sum is σ = 3052707840. Its totient is φ = 737178624.

The previous prime is 1640908583. The next prime is 1640908627. The reversal of 1640908605 is 5068090461.

It is an interprime number because it is at equal distance from previous prime (1640908583) and next prime (1640908627).

It is not a de Polignac number, because 1640908605 - 2¹² = 1640904509 is a prime.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 2795122 + ... + 2795708.

It is an arithmetic number, because the mean of its divisors is an integer number (47698560).

Almost surely, 2^1640908605 is an apocalyptic number.

1640908605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640908605 is a deficient number, since it is larger than the sum of its proper divisors (1411799235).

1640908605 is a wasteful number, since it uses less digits than its factorization.

1640908605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1640908605 is about 40508.1301098928. The cubic root of 1640908605 is about 1179.4914511179.

The spelling of 1640908605 in words is "one billion, six hundred forty million, nine hundred eight thousand, six hundred five".