1678090864078 has 4 divisors (see below), whose sum is σ = 2517136296120. Its totient is φ = 839045432038.

The previous prime is 1678090864057. The next prime is 1678090864091. The reversal of 1678090864078 is 8704680908761.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419522716018 + ... + 419522716021.

It is an arithmetic number, because the mean of its divisors is an integer number (629284074030).

Almost surely, 2^{1678090864078} is an apocalyptic number.

1678090864078 is a deficient number, since it is larger than the sum of its proper divisors (839045432042).

1678090864078 is an equidigital number, since it uses as much as digits as its factorization.

1678090864078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839045432041.

The product of its (nonzero) digits is 32514048, while the sum is 64.

The spelling of 1678090864078 in words is "one trillion, six hundred seventy-eight billion, ninety million, eight hundred sixty-four thousand, seventy-eight".