1543670644 has 12 divisors (see below), whose sum is σ = 2726208100. Its totient is φ = 764754048.

The previous prime is 1543670641. The next prime is 1543670651. The reversal of 1543670644 is 4460763451.

It can be written as a sum of positive squares in 2 ways, for example, as 1323504400 + 220166244 = 36380^2 + 14838^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1543670597 and 1543670606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1543670641) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1769829 + ... + 1770700.

Almost surely, 2^1543670644 is an apocalyptic number.

It is an amenable number.

1543670644 is a deficient number, since it is larger than the sum of its proper divisors (1182537456).

1543670644 is a wasteful number, since it uses less digits than its factorization.

1543670644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540642 (or 3540640 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 1543670644 is about 39289.5742405030. The cubic root of 1543670644 is about 1155.7171246649.

The spelling of 1543670644 in words is "one billion, five hundred forty-three million, six hundred seventy thousand, six hundred forty-four".