1690656889 has 8 divisors (see below), whose sum is σ = 1746178560. Its totient is φ = 1635196800.

The previous prime is 1690656829. The next prime is 1690656923. The reversal of 1690656889 is 9886560961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1690656889 - 2¹¹ = 1690654841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690656809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44124 + ... + 72994.

It is an arithmetic number, because the mean of its divisors is an integer number (218272320).

Almost surely, 2^1690656889 is an apocalyptic number.

It is an amenable number.

1690656889 is a deficient number, since it is larger than the sum of its proper divisors (55521671).

1690656889 is a wasteful number, since it uses less digits than its factorization.

1690656889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30791.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The square root of 1690656889 is about 41117.5982883242. The cubic root of 1690656889 is about 1191.2927337515.

The spelling of 1690656889 in words is "one billion, six hundred ninety million, six hundred fifty-six thousand, eight hundred eighty-nine".