1640504705 has 16 divisors (see below), whose sum is σ = 2310643200. Its totient is φ = 1094513472.

The previous prime is 1640504699. The next prime is 1640504713. The reversal of 1640504705 is 5074050461.

It is a cyclic number.

It is not a de Polignac number, because 1640504705 - 2⁴ = 1640504689 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632105 + ... + 634694.

It is an arithmetic number, because the mean of its divisors is an integer number (144415200).

Almost surely, 2^1640504705 is an apocalyptic number.

It is an amenable number.

1640504705 is a deficient number, since it is larger than the sum of its proper divisors (670138495).

1640504705 is a wasteful number, since it uses less digits than its factorization.

1640504705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266848.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 1640504705 is about 40503.1443841092. The cubic root of 1640504705 is about 1179.3946682160.

The spelling of 1640504705 in words is "one billion, six hundred forty million, five hundred four thousand, seven hundred five".