688545355 has 4 divisors (see below), whose sum is σ = 826254432. Its totient is φ = 550836280.

The previous prime is 688545329. The next prime is 688545367. The reversal of 688545355 is 553545886.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 688545355 - 2¹⁹ = 688021067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688545299 and 688545308.

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, 68854531 + ... + 68854540.

It is an arithmetic number, because the mean of its divisors is an integer number (206563608).

Almost surely, 2^688545355 is an apocalyptic number.

688545355 is a deficient number, since it is larger than the sum of its proper divisors (137709077).

688545355 is a wasteful number, since it uses less digits than its factorization.

688545355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137709076.

The product of its digits is 2880000, while the sum is 49.

The square root of 688545355 is about 26240.1477701632. The cubic root of 688545355 is about 883.0341866667.

It can be divided in two parts, 688545 and 355, that added together give a square (688900 = 830²).

The spelling of 688545355 in words is "six hundred eighty-eight million, five hundred forty-five thousand, three hundred fifty-five".