688405461 has 8 divisors (see below), whose sum is σ = 942681504. Its totient is φ = 446533200.

The previous prime is 688405391. The next prime is 688405469. The reversal of 688405461 is 164504886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 688405461 - 2⁹ = 688404949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688405469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3100815 + ... + 3101036.

It is an arithmetic number, because the mean of its divisors is an integer number (117835188).

Almost surely, 2^688405461 is an apocalyptic number.

It is an amenable number.

688405461 is a deficient number, since it is larger than the sum of its proper divisors (254276043).

688405461 is a wasteful number, since it uses less digits than its factorization.

688405461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201891.

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 688405461 is about 26237.4819866541. The cubic root of 688405461 is about 882.9743796399.

The spelling of 688405461 in words is "six hundred eighty-eight million, four hundred five thousand, four hundred sixty-one".