1640743705 has 8 divisors (see below), whose sum is σ = 1969200000. Its totient is φ = 1312389936.

The previous prime is 1640743697. The next prime is 1640743777. The reversal of 1640743705 is 5073470461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640743705 - 2³ = 1640743697 is a prime.

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, 15616 + ... + 59374.

It is an arithmetic number, because the mean of its divisors is an integer number (246150000).

Almost surely, 2^1640743705 is an apocalyptic number.

It is an amenable number.

1640743705 is a deficient number, since it is larger than the sum of its proper divisors (328456295).

1640743705 is an equidigital number, since it uses as much as digits as its factorization.

1640743705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51263.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 1640743705 is about 40506.0946648773. The cubic root of 1640743705 is about 1179.4519395418.

The spelling of 1640743705 in words is "one billion, six hundred forty million, seven hundred forty-three thousand, seven hundred five".