1640706315 has 16 divisors (see below), whose sum is σ = 2680985088. Its totient is φ = 856425056.

The previous prime is 1640706299. The next prime is 1640706343. The reversal of 1640706315 is 5136070461.

It is a cyclic number.

It is not a de Polignac number, because 1640706315 - 2⁴ = 1640706299 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, 1162917 + ... + 1164326.

It is an arithmetic number, because the mean of its divisors is an integer number (167561568).

Almost surely, 2^1640706315 is an apocalyptic number.

1640706315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1640706315 is a deficient number, since it is larger than the sum of its proper divisors (1040278773).

1640706315 is a wasteful number, since it uses less digits than its factorization.

1640706315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327298.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 1640706315 is about 40505.6331267640. The cubic root of 1640706315 is about 1179.4429801813.

Adding to 1640706315 its reverse (5136070461), we get a palindrome (6776776776).

The spelling of 1640706315 in words is "one billion, six hundred forty million, seven hundred six thousand, three hundred fifteen".