1678892689 has 4 divisors (see below), whose sum is σ = 1684825456. Its totient is φ = 1672959924.

The previous prime is 1678892671. The next prime is 1678892711. The reversal of 1678892689 is 9862988761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9862988761 = 79 ⋅124847959.

It is a cyclic number.

It is not a de Polignac number, because 1678892689 - 2⁷ = 1678892561 is a prime.

It is a super-2 number, since 2×1678892689² = 5637361322355301442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1678892689.

It is not an unprimeable number, because it can be changed into a prime (1678892639) 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, 2965959 + ... + 2966524.

It is an arithmetic number, because the mean of its divisors is an integer number (421206364).

Almost surely, 2^1678892689 is an apocalyptic number.

It is an amenable number.

1678892689 is a deficient number, since it is larger than the sum of its proper divisors (5932767).

1678892689 is an equidigital number, since it uses as much as digits as its factorization.

1678892689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5932766.

The product of its digits is 20901888, while the sum is 64.

The square root of 1678892689 is about 40974.2930262378. The cubic root of 1678892689 is about 1188.5231517933.

The spelling of 1678892689 in words is "one billion, six hundred seventy-eight million, eight hundred ninety-two thousand, six hundred eighty-nine".