1678142643 has 16 divisors (see below), whose sum is σ = 2361532800. Its totient is φ = 1057069440.

The previous prime is 1678142593. The next prime is 1678142671. The reversal of 1678142643 is 3462418761.

It is not a de Polignac number, because 1678142643 - 2⁶ = 1678142579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1678142595 and 1678142604.

It is not an unprimeable number, because it can be changed into a prime (1678142143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17238 + ... + 60443.

It is an arithmetic number, because the mean of its divisors is an integer number (147595800).

Almost surely, 2^1678142643 is an apocalyptic number.

1678142643 is a deficient number, since it is larger than the sum of its proper divisors (683390157).

1678142643 is a wasteful number, since it uses less digits than its factorization.

1678142643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78082.

The product of its digits is 193536, while the sum is 42.

The square root of 1678142643 is about 40965.1393626337. The cubic root of 1678142643 is about 1188.3461343606.

The spelling of 1678142643 in words is "one billion, six hundred seventy-eight million, one hundred forty-two thousand, six hundred forty-three".