688417481 has 4 divisors (see below), whose sum is σ = 724650000. Its totient is φ = 652184964.

The previous prime is 688417459. The next prime is 688417489. The reversal of 688417481 is 184714886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 688417481 - 2⁶ = 688417417 is a prime.

It is a super-2 number, since 2×688417481² = 947837256292770722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688417489) 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, 18116231 + ... + 18116268.

It is an arithmetic number, because the mean of its divisors is an integer number (181162500).

Almost surely, 2^688417481 is an apocalyptic number.

It is an amenable number.

688417481 is a deficient number, since it is larger than the sum of its proper divisors (36232519).

688417481 is a wasteful number, since it uses less digits than its factorization.

688417481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36232518.

The product of its digits is 344064, while the sum is 47.

The square root of 688417481 is about 26237.7110472693. The cubic root of 688417481 is about 882.9795187093.

The spelling of 688417481 in words is "six hundred eighty-eight million, four hundred seventeen thousand, four hundred eighty-one".