688473849 has 16 divisors (see below), whose sum is σ = 1050089472. Its totient is φ = 393043728.

The previous prime is 688473847. The next prime is 688473853. The reversal of 688473849 is 948374886.

It is not a de Polignac number, because 688473849 - 2¹ = 688473847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688473847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8302 + ... + 38024.

It is an arithmetic number, because the mean of its divisors is an integer number (65630592).

Almost surely, 2^688473849 is an apocalyptic number.

It is an amenable number.

688473849 is a deficient number, since it is larger than the sum of its proper divisors (361615623).

688473849 is a wasteful number, since it uses less digits than its factorization.

688473849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30836.

The product of its digits is 9289728, while the sum is 57.

The square root of 688473849 is about 26238.7852043497. The cubic root of 688473849 is about 883.0036176669.

The spelling of 688473849 in words is "six hundred eighty-eight million, four hundred seventy-three thousand, eight hundred forty-nine".