1682494778 has 8 divisors (see below), whose sum is σ = 2585296980. Its totient is φ = 820729120.

The previous prime is 1682494771. The next prime is 1682494787. The reversal of 1682494778 is 8774942861.

It can be written as a sum of positive squares in 2 ways, for example, as 1682394289 + 100489 = 41017^2 + 317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1682494771) 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, 10259033 + ... + 10259196.

Almost surely, 2^1682494778 is an apocalyptic number.

1682494778 is a deficient number, since it is larger than the sum of its proper divisors (902802202).

1682494778 is a wasteful number, since it uses less digits than its factorization.

1682494778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20518272.

The product of its digits is 5419008, while the sum is 56.

The square root of 1682494778 is about 41018.2249494051. The cubic root of 1682494778 is about 1189.3725426001.

The spelling of 1682494778 in words is "one billion, six hundred eighty-two million, four hundred ninety-four thousand, seven hundred seventy-eight".