689245745 has 4 divisors (see below), whose sum is σ = 827094900. Its totient is φ = 551396592.

The previous prime is 689245699. The next prime is 689245747. The reversal of 689245745 is 547542986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547542986 = 2 ⋅273771493.

It can be written as a sum of positive squares in 2 ways, for example, as 442849936 + 246395809 = 21044^2 + 15697^2 .

It is a cyclic number.

It is not a de Polignac number, because 689245745 - 2⁶ = 689245681 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 689245693 and 689245702.

It is not an unprimeable number, because it can be changed into a prime (689245747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68924570 + ... + 68924579.

It is an arithmetic number, because the mean of its divisors is an integer number (206773725).

Almost surely, 2^689245745 is an apocalyptic number.

It is an amenable number.

689245745 is a deficient number, since it is larger than the sum of its proper divisors (137849155).

689245745 is a wasteful number, since it uses less digits than its factorization.

689245745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137849154.

The product of its digits is 2419200, while the sum is 50.

The square root of 689245745 is about 26253.4901489307. The cubic root of 689245745 is about 883.3334933744. Note that the first 3 decimals are identical.

The spelling of 689245745 in words is "six hundred eighty-nine million, two hundred forty-five thousand, seven hundred forty-five".