688268155 has 4 divisors (see below), whose sum is σ = 825921792. Its totient is φ = 550614520.

The previous prime is 688268149. The next prime is 688268177. The reversal of 688268155 is 551862886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551862886 = 2 ⋅275931443.

It is not a de Polignac number, because 688268155 - 2¹¹ = 688266107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688268099 and 688268108.

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, 68826811 + ... + 68826820.

It is an arithmetic number, because the mean of its divisors is an integer number (206480448).

Almost surely, 2^688268155 is an apocalyptic number.

688268155 is a deficient number, since it is larger than the sum of its proper divisors (137653637).

688268155 is a wasteful number, since it uses less digits than its factorization.

688268155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137653636.

The product of its digits is 921600, while the sum is 49.

The square root of 688268155 is about 26234.8652559909. The cubic root of 688268155 is about 882.9156711469.

The spelling of 688268155 in words is "six hundred eighty-eight million, two hundred sixty-eight thousand, one hundred fifty-five".