689120621 has 8 divisors (see below), whose sum is σ = 791099904. Its totient is φ = 588024720.

The previous prime is 689120617. The next prime is 689120639. The reversal of 689120621 is 126021986.

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 689120621 - 2² = 689120617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689120221) 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, 219170 + ... + 222291.

It is an arithmetic number, because the mean of its divisors is an integer number (98887488).

Almost surely, 2^689120621 is an apocalyptic number.

It is an amenable number.

689120621 is a deficient number, since it is larger than the sum of its proper divisors (101979283).

689120621 is a wasteful number, since it uses less digits than its factorization.

689120621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441691.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 689120621 is about 26251.1070433230. The cubic root of 689120621 is about 883.2800373999.

The spelling of 689120621 in words is "six hundred eighty-nine million, one hundred twenty thousand, six hundred twenty-one".