1640464564 has 6 divisors (see below), whose sum is σ = 2870812994. Its totient is φ = 820232280.

The previous prime is 1640464559. The next prime is 1640464601. The reversal of 1640464564 is 4654640461.

It can be written as a sum of positive squares in only one way, i.e., 1628768164 + 11696400 = 40358^2 + 3420^2 .

It is a super-2 number, since 2×1640464564² = 5382247971479420192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205058067 + ... + 205058074.

Almost surely, 2^1640464564 is an apocalyptic number.

It is an amenable number.

1640464564 is a deficient number, since it is larger than the sum of its proper divisors (1230348430).

1640464564 is a wasteful number, since it uses less digits than its factorization.

1640464564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410116145 (or 410116143 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The square root of 1640464564 is about 40502.6488516492. The cubic root of 1640464564 is about 1179.3850487236.

The spelling of 1640464564 in words is "one billion, six hundred forty million, four hundred sixty-four thousand, five hundred sixty-four".