688138234494 has 32 divisors (see below), whose sum is σ = 1416566278176. Its totient is φ = 222691576320.

The previous prime is 688138234493. The next prime is 688138234507. The reversal of 688138234494 is 494432831886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688138234493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3289927 + ... + 3492834.

It is an arithmetic number, because the mean of its divisors is an integer number (44267696193).

Almost surely, 2^688138234494 is an apocalyptic number.

688138234494 is an abundant number, since it is smaller than the sum of its proper divisors (728428043682).

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

688138234494 is a wasteful number, since it uses less digits than its factorization.

688138234494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783260.

The product of its digits is 31850496, while the sum is 60.

The spelling of 688138234494 in words is "six hundred eighty-eight billion, one hundred thirty-eight million, two hundred thirty-four thousand, four hundred ninety-four".