1678746789 has 48 divisors (see below), whose sum is σ = 2586135552. Its totient is φ = 1087633008.

The previous prime is 1678746743. The next prime is 1678746863. The reversal of 1678746789 is 9876478761.

1678746789 is a `hidden beast` number, since 16 + 7 + 87 + 467 + 89 = 666.

It is not a de Polignac number, because 1678746789 - 2¹² = 1678742693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678746709) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3625572 + ... + 3626034.

It is an arithmetic number, because the mean of its divisors is an integer number (53877824).

Almost surely, 2^1678746789 is an apocalyptic number.

It is an amenable number.

1678746789 is a deficient number, since it is larger than the sum of its proper divisors (907388763).

1678746789 is an equidigital number, since it uses as much as digits as its factorization.

1678746789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 856 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The square root of 1678746789 is about 40972.5126029635. The cubic root of 1678746789 is about 1188.4887222449.

The spelling of 1678746789 in words is "one billion, six hundred seventy-eight million, seven hundred forty-six thousand, seven hundred eighty-nine".