688856454 has 128 divisors (see below), whose sum is σ = 1847784960. Its totient is φ = 187401600.

The previous prime is 688856453. The next prime is 688856479. The reversal of 688856454 is 454658886.

688856454 is a `hidden beast` number, since 68 + 88 + 56 + 454 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 688856454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688856453) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 284509 + ... + 286919.

It is an arithmetic number, because the mean of its divisors is an integer number (14435820).

Almost surely, 2^688856454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688856454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923892480).

688856454 is an abundant number, since it is smaller than the sum of its proper divisors (1158928506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688856454 is a wasteful number, since it uses less digits than its factorization.

688856454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483 (or 2477 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 54.

The square root of 688856454 is about 26246.0750208484. The cubic root of 688856454 is about 883.1671576649.

The spelling of 688856454 in words is "six hundred eighty-eight million, eight hundred fifty-six thousand, four hundred fifty-four".