1640993450 has 12 divisors (see below), whose sum is σ = 3052247910. Its totient is φ = 656397360.

The previous prime is 1640993447. The next prime is 1640993467. The reversal of 1640993450 is 543990461.

It can be written as a sum of positive squares in 3 ways, for example, as 1353724849 + 287268601 = 36793^2 + 16949^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1640993398 and 1640993407.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16409885 + ... + 16409984.

Almost surely, 2^1640993450 is an apocalyptic number.

1640993450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640993450 is a deficient number, since it is larger than the sum of its proper divisors (1411254460).

1640993450 is a wasteful number, since it uses less digits than its factorization.

1640993450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32819881 (or 32819876 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 1640993450 is about 40509.1773552611. The cubic root of 1640993450 is about 1179.5117797389.

The spelling of 1640993450 in words is "one billion, six hundred forty million, nine hundred ninety-three thousand, four hundred fifty".