689659641 has 24 divisors (see below), whose sum is σ = 1087821696. Its totient is φ = 417558240.

The previous prime is 689659637. The next prime is 689659667. The reversal of 689659641 is 146956986.

It is a happy number.

689659641 is a `hidden beast` number, since 6 + 8 + 9 + 6 + 596 + 41 = 666.

It is not a de Polignac number, because 689659641 - 2² = 689659637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689659601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117216 + ... + 122958.

It is an arithmetic number, because the mean of its divisors is an integer number (45325904).

Almost surely, 2^689659641 is an apocalyptic number.

It is an amenable number.

689659641 is a deficient number, since it is larger than the sum of its proper divisors (398162055).

689659641 is a wasteful number, since it uses less digits than its factorization.

689659641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973 (or 6970 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 689659641 is about 26261.3716511533. The cubic root of 689659641 is about 883.5102735932.

It can be divided in two parts, 68965 and 9641, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 689659641 in words is "six hundred eighty-nine million, six hundred fifty-nine thousand, six hundred forty-one".