688403361 has 16 divisors (see below), whose sum is σ = 934190208. Its totient is φ = 450796800.

The previous prime is 688403333. The next prime is 688403369. The reversal of 688403361 is 163304886.

It is not a de Polignac number, because 688403361 - 2¹⁸ = 688141217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688403369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160201 + ... + 164441.

It is an arithmetic number, because the mean of its divisors is an integer number (58386888).

Almost surely, 2^688403361 is an apocalyptic number.

688403361 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

688403361 is a deficient number, since it is larger than the sum of its proper divisors (245786847).

688403361 is a wasteful number, since it uses less digits than its factorization.

688403361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5192.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 688403361 is about 26237.4419675394. The cubic root of 688403361 is about 882.9734817930.

The spelling of 688403361 in words is "six hundred eighty-eight million, four hundred three thousand, three hundred sixty-one".