1689616976 has 20 divisors (see below), whose sum is σ = 3285810900. Its totient is φ = 841665792.

The previous prime is 1689616967. The next prime is 1689616993. The reversal of 1689616976 is 6796169861.

It can be written as a sum of positive squares in 2 ways, for example, as 427662400 + 1261954576 = 20680^2 + 35524^2 .

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191981 + ... + 200588.

It is an arithmetic number, because the mean of its divisors is an integer number (164290545).

Almost surely, 2^1689616976 is an apocalyptic number.

1689616976 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1689616976 is a deficient number, since it is larger than the sum of its proper divisors (1596193924).

1689616976 is a wasteful number, since it uses less digits than its factorization.

1689616976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392846 (or 392840 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 59.

The square root of 1689616976 is about 41104.9507480547. The cubic root of 1689616976 is about 1191.0484312959.

The spelling of 1689616976 in words is "one billion, six hundred eighty-nine million, six hundred sixteen thousand, nine hundred seventy-six".