688091442 has 16 divisors (see below), whose sum is σ = 1413377472. Its totient is φ = 223164720.

The previous prime is 688091429. The next prime is 688091449. The reversal of 688091442 is 244190886.

It is a junction number, because it is equal to n+sod(n) for n = 688091394 and 688091403.

It is not an unprimeable number, because it can be changed into a prime (688091449) 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, 1549534 + ... + 1549977.

It is an arithmetic number, because the mean of its divisors is an integer number (88336092).

Almost surely, 2^688091442 is an apocalyptic number.

688091442 is an abundant number, since it is smaller than the sum of its proper divisors (725286030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688091442 is a wasteful number, since it uses less digits than its factorization.

688091442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099553.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 688091442 is about 26231.4971360767. The cubic root of 688091442 is about 882.8401017482.

The spelling of 688091442 in words is "six hundred eighty-eight million, ninety-one thousand, four hundred forty-two".