1678420685 has 16 divisors (see below), whose sum is σ = 2052412992. Its totient is φ = 1317360000.

The previous prime is 1678420633. The next prime is 1678420687. The reversal of 1678420685 is 5860248761.

It is not a de Polignac number, because 1678420685 - 2⁶ = 1678420621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678420687) 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, 74105 + ... + 94065.

It is an arithmetic number, because the mean of its divisors is an integer number (128275812).

Almost surely, 2^1678420685 is an apocalyptic number.

It is an amenable number.

1678420685 is a deficient number, since it is larger than the sum of its proper divisors (373992307).

1678420685 is a wasteful number, since it uses less digits than its factorization.

1678420685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20284.

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 1678420685 is about 40968.5328636504. The cubic root of 1678420685 is about 1188.4117608617.

The spelling of 1678420685 in words is "one billion, six hundred seventy-eight million, four hundred twenty thousand, six hundred eighty-five".