688448355 has 16 divisors (see below), whose sum is σ = 1258877184. Its totient is φ = 314719200.

The previous prime is 688448353. The next prime is 688448357. The reversal of 688448355 is 553844886.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (688448353) and next prime (688448357).

It is not a de Polignac number, because 688448355 - 2¹ = 688448353 is a prime.

It is a super-2 number, since 2×688448355² = 947922275004412050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688448298 and 688448307.

It is not an unprimeable number, because it can be changed into a prime (688448353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3278221 + ... + 3278430.

It is an arithmetic number, because the mean of its divisors is an integer number (78679824).

Almost surely, 2^688448355 is an apocalyptic number.

688448355 is a deficient number, since it is larger than the sum of its proper divisors (570428829).

688448355 is a wasteful number, since it uses less digits than its factorization.

688448355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6556666.

The product of its digits is 3686400, while the sum is 51.

The square root of 688448355 is about 26238.2993923006. The cubic root of 688448355 is about 882.9927184042.

The spelling of 688448355 in words is "six hundred eighty-eight million, four hundred forty-eight thousand, three hundred fifty-five".