689768258 has 4 divisors (see below), whose sum is σ = 1034652390. Its totient is φ = 344884128.

The previous prime is 689768249. The next prime is 689768273. The reversal of 689768258 is 852867986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 852867986 = 2 ⋅426433993.

It can be written as a sum of positive squares in only one way, i.e., 404935129 + 284833129 = 20123^2 + 16877^2 .

It is a junction number, because it is equal to n+sod(n) for n = 689768197 and 689768206.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172442063 + ... + 172442066.

Almost surely, 2^689768258 is an apocalyptic number.

689768258 is a deficient number, since it is larger than the sum of its proper divisors (344884132).

689768258 is a wasteful number, since it uses less digits than its factorization.

689768258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344884131.

The product of its digits is 11612160, while the sum is 59.

The square root of 689768258 is about 26263.4395691044. The cubic root of 689768258 is about 883.5566535717.

The spelling of 689768258 in words is "six hundred eighty-nine million, seven hundred sixty-eight thousand, two hundred fifty-eight".