1678397066 has 32 divisors (see below), whose sum is σ = 2600994240. Its totient is φ = 811958400.

The previous prime is 1678397059. The next prime is 1678397081. The reversal of 1678397066 is 6607938761.

It is a super-2 number, since 2×1678397066² = 5634033422314816712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1678396999 and 1678397017.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3593765 + ... + 3594231.

It is an arithmetic number, because the mean of its divisors is an integer number (81281070).

Almost surely, 2^1678397066 is an apocalyptic number.

1678397066 is a deficient number, since it is larger than the sum of its proper divisors (922597174).

1678397066 is a wasteful number, since it uses less digits than its factorization.

1678397066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 1678397066 is about 40968.2446048156. The cubic root of 1678397066 is about 1188.4061863298.

The spelling of 1678397066 in words is "one billion, six hundred seventy-eight million, three hundred ninety-seven thousand, sixty-six".