1678636426 has 4 divisors (see below), whose sum is σ = 2517954642. Its totient is φ = 839318212.

The previous prime is 1678636417. The next prime is 1678636433. The reversal of 1678636426 is 6246368761.

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

It can be written as a sum of positive squares in only one way, i.e., 1660155025 + 18481401 = 40745^2 + 4299^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1678636426.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419659105 + ... + 419659108.

Almost surely, 2^1678636426 is an apocalyptic number.

1678636426 is a deficient number, since it is larger than the sum of its proper divisors (839318216).

1678636426 is an equidigital number, since it uses as much as digits as its factorization.

1678636426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839318215.

The product of its digits is 1741824, while the sum is 49.

The square root of 1678636426 is about 40971.1657876610. The cubic root of 1678636426 is about 1188.4626774087.

The spelling of 1678636426 in words is "one billion, six hundred seventy-eight million, six hundred thirty-six thousand, four hundred twenty-six".