1640143144 has 16 divisors (see below), whose sum is σ = 3075834420. Its totient is φ = 819920640.

The previous prime is 1640143123. The next prime is 1640143147. The reversal of 1640143144 is 4413410461.

It can be written as a sum of positive squares in 2 ways, for example, as 1526464900 + 113678244 = 39070^2 + 10662^2 .

It is not an unprimeable number, because it can be changed into a prime (1640143147) 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, 37072 + ... + 68224.

Almost surely, 2^1640143144 is an apocalyptic number.

It is an amenable number.

1640143144 is a deficient number, since it is larger than the sum of its proper divisors (1435691276).

1640143144 is a wasteful number, since it uses less digits than its factorization.

1640143144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37740 (or 37736 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1640143144 is about 40498.6807686374. The cubic root of 1640143144 is about 1179.3080171495.

The spelling of 1640143144 in words is "one billion, six hundred forty million, one hundred forty-three thousand, one hundred forty-four".