1689390078774 has 36 divisors (see below), whose sum is σ = 3491492944212. Its totient is φ = 544932703920.

The previous prime is 1689390078763. The next prime is 1689390078797. The reversal of 1689390078774 is 4778700939861.

It is a junction number, because it is equal to n+sod(n) for n = 1689390078699 and 1689390078708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 98688064 + ... + 98705180.

It is an arithmetic number, because the mean of its divisors is an integer number (96985915117).

Almost surely, 2^{1689390078774} is an apocalyptic number.

1689390078774 is an abundant number, since it is smaller than the sum of its proper divisors (1802102865438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1689390078774 is an frugal number, since it uses more digits than its factorization.

1689390078774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34301 (or 17153 counting only the distinct ones).

The product of its (nonzero) digits is 128024064, while the sum is 69.

The spelling of 1689390078774 in words is "one trillion, six hundred eighty-nine billion, three hundred ninety million, seventy-eight thousand, seven hundred seventy-four".