1640464313 has 4 divisors (see below), whose sum is σ = 1726804560. Its totient is φ = 1554124068.

The previous prime is 1640464307. The next prime is 1640464327. The reversal of 1640464313 is 3134640461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3134640461 = 587 ⋅5340103.

It is a cyclic number.

It is not a de Polignac number, because 1640464313 - 2⁴ = 1640464297 is a prime.

It is a super-2 number, since 2×1640464313² = 5382246324453123938, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640464313.

It is not an unprimeable number, because it can be changed into a prime (1640464363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43170095 + ... + 43170132.

It is an arithmetic number, because the mean of its divisors is an integer number (431701140).

Almost surely, 2^1640464313 is an apocalyptic number.

It is an amenable number.

1640464313 is a deficient number, since it is larger than the sum of its proper divisors (86340247).

1640464313 is an equidigital number, since it uses as much as digits as its factorization.

1640464313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86340246.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 1640464313 is about 40502.6457530863. The cubic root of 1640464313 is about 1179.3849885728.

The spelling of 1640464313 in words is "one billion, six hundred forty million, four hundred sixty-four thousand, three hundred thirteen".