688478134 has 8 divisors (see below), whose sum is σ = 1032832440. Its totient is φ = 344200656.

The previous prime is 688478093. The next prime is 688478171. The reversal of 688478134 is 431874886.

It is a happy number.

688478134 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×688478134² = 948004281992243912, which contains 22 as substring.

It is a congruent number.

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, 16402 + ... + 40570.

It is an arithmetic number, because the mean of its divisors is an integer number (129104055).

Almost surely, 2^688478134 is an apocalyptic number.

688478134 is a deficient number, since it is larger than the sum of its proper divisors (344354306).

688478134 is a wasteful number, since it uses less digits than its factorization.

688478134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38414.

The product of its digits is 1032192, while the sum is 49.

The square root of 688478134 is about 26238.8668581553. The cubic root of 688478134 is about 883.0054495751.

The spelling of 688478134 in words is "six hundred eighty-eight million, four hundred seventy-eight thousand, one hundred thirty-four".