687948458 has 8 divisors (see below), whose sum is σ = 1032292452. Its totient is φ = 343850976.

The previous prime is 687948439. The next prime is 687948461. The reversal of 687948458 is 854849786.

It can be written as a sum of positive squares in 2 ways, for example, as 640241809 + 47706649 = 25303^2 + 6907^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 687948397 and 687948406.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54485 + ... + 65912.

Almost surely, 2^687948458 is an apocalyptic number.

687948458 is a deficient number, since it is larger than the sum of its proper divisors (344343994).

687948458 is a wasteful number, since it uses less digits than its factorization.

687948458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123256.

The product of its digits is 15482880, while the sum is 59.

The square root of 687948458 is about 26228.7715686419. The cubic root of 687948458 is about 882.7789467205.

The spelling of 687948458 in words is "six hundred eighty-seven million, nine hundred forty-eight thousand, four hundred fifty-eight".