688124461 has 4 divisors (see below), whose sum is σ = 694214172. Its totient is φ = 682034752.

The previous prime is 688124447. The next prime is 688124473. The reversal of 688124461 is 164421886.

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

It can be written as a sum of positive squares in 2 ways, for example, as 243547236 + 444577225 = 15606^2 + 21085^2 .

It is a cyclic number.

It is not a de Polignac number, because 688124461 - 2⁵ = 688124429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688124491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3044686 + ... + 3044911.

It is an arithmetic number, because the mean of its divisors is an integer number (173553543).

Almost surely, 2^688124461 is an apocalyptic number.

It is an amenable number.

688124461 is a deficient number, since it is larger than the sum of its proper divisors (6089711).

688124461 is a wasteful number, since it uses less digits than its factorization.

688124461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6089710.

The product of its digits is 73728, while the sum is 40.

The square root of 688124461 is about 26232.1265054894. The cubic root of 688124461 is about 882.8542229484.

The spelling of 688124461 in words is "six hundred eighty-eight million, one hundred twenty-four thousand, four hundred sixty-one".