1640735340 has 24 divisors (see below), whose sum is σ = 4594059120. Its totient is φ = 437529408.

The previous prime is 1640735333. The next prime is 1640735353. The reversal of 1640735340 is 435370461.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13672735 + ... + 13672854.

It is an arithmetic number, because the mean of its divisors is an integer number (191419130).

Almost surely, 2^1640735340 is an apocalyptic number.

1640735340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640735340 is an abundant number, since it is smaller than the sum of its proper divisors (2953323780).

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

1640735340 is a wasteful number, since it uses less digits than its factorization.

1640735340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27345601 (or 27345599 counting only the distinct ones).

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

The square root of 1640735340 is about 40505.9914086793. The cubic root of 1640735340 is about 1179.4499351393.

The spelling of 1640735340 in words is "one billion, six hundred forty million, seven hundred thirty-five thousand, three hundred forty".