689538621 has 16 divisors (see below), whose sum is σ = 924416064. Its totient is φ = 457185024.

The previous prime is 689538601. The next prime is 689538653. The reversal of 689538621 is 126835986.

It is a happy number.

It is not a de Polignac number, because 689538621 - 2⁵ = 689538589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689538601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616755 + ... + 617871.

It is an arithmetic number, because the mean of its divisors is an integer number (57776004).

Almost surely, 2^689538621 is an apocalyptic number.

It is an amenable number.

689538621 is a deficient number, since it is larger than the sum of its proper divisors (234877443).

689538621 is a wasteful number, since it uses less digits than its factorization.

689538621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060.

The product of its digits is 622080, while the sum is 48.

The square root of 689538621 is about 26259.0674053745. The cubic root of 689538621 is about 883.4585917385.

The spelling of 689538621 in words is "six hundred eighty-nine million, five hundred thirty-eight thousand, six hundred twenty-one".