688774494 has 16 divisors (see below), whose sum is σ = 1378090368. Its totient is φ = 229501272.

The previous prime is 688774483. The next prime is 688774501. The reversal of 688774494 is 494477886.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4962 + ... + 37445.

It is an arithmetic number, because the mean of its divisors is an integer number (86130648).

Almost surely, 2^688774494 is an apocalyptic number.

688774494 is an abundant number, since it is smaller than the sum of its proper divisors (689315874).

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

688774494 is a wasteful number, since it uses less digits than its factorization.

688774494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45119.

The product of its digits is 10838016, while the sum is 57.

The square root of 688774494 is about 26244.5135980837. The cubic root of 688774494 is about 883.1321299264.

The spelling of 688774494 in words is "six hundred eighty-eight million, seven hundred seventy-four thousand, four hundred ninety-four".