1993640570 has 16 divisors (see below), whose sum is σ = 3589335720. Its totient is φ = 797282304.

The previous prime is 1993640471. The next prime is 1993640587. The reversal of 1993640570 is 750463991.

It can be written as a sum of positive squares in 4 ways, for example, as 1978203529 + 15437041 = 44477^2 + 3929^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32954 + ... + 71226.

Almost surely, 2^1993640570 is an apocalyptic number.

1993640570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1993640570 is a deficient number, since it is larger than the sum of its proper divisors (1595695150).

1993640570 is a wasteful number, since it uses less digits than its factorization.

1993640570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43489.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 1993640570 is about 44650.2023511652. The cubic root of 1993640570 is about 1258.5842353753.

It can be divided in two parts, 19936 and 40570, that added together give a palindrome (60506).

The spelling of 1993640570 in words is "one billion, nine hundred ninety-three million, six hundred forty thousand, five hundred seventy".