689561247 has 8 divisors (see below), whose sum is σ = 941839920. Its totient is φ = 448495040.

The previous prime is 689561233. The next prime is 689561273. The reversal of 689561247 is 742165986.

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 689561247 - 2¹⁶ = 689495711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689561196 and 689561205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689561447) 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, 2802972 + ... + 2803217.

It is an arithmetic number, because the mean of its divisors is an integer number (117729990).

Almost surely, 2^689561247 is an apocalyptic number.

689561247 is a deficient number, since it is larger than the sum of its proper divisors (252278673).

689561247 is a wasteful number, since it uses less digits than its factorization.

689561247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5606233.

The product of its digits is 725760, while the sum is 48.

The square root of 689561247 is about 26259.4982244520. The cubic root of 689561247 is about 883.4682546807.

The spelling of 689561247 in words is "six hundred eighty-nine million, five hundred sixty-one thousand, two hundred forty-seven".