688890128818 has 16 divisors (see below), whose sum is σ = 1100444016600. Its totient is φ = 322309693696.

The previous prime is 688890128803. The next prime is 688890128833. The reversal of 688890128818 is 818821098886.

It is an interprime number because it is at equal distance from previous prime (688890128803) and next prime (688890128833).

It can be written as a sum of positive squares in 4 ways, for example, as 684983003769 + 3907125049 = 827637^2 + 62507^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58553293 + ... + 58565056.

Almost surely, 2^688890128818 is an apocalyptic number.

688890128818 is a deficient number, since it is larger than the sum of its proper divisors (411553887782).

688890128818 is a wasteful number, since it uses less digits than its factorization.

688890128818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117118541.

The product of its (nonzero) digits is 28311552, while the sum is 67.

The spelling of 688890128818 in words is "six hundred eighty-eight billion, eight hundred ninety million, one hundred twenty-eight thousand, eight hundred eighteen".