688781563998 has 32 divisors (see below), whose sum is σ = 1531150791552. Its totient is φ = 204783540000.

The previous prime is 688781563991. The next prime is 688781564057. The reversal of 688781563998 is 899365187886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688781563991) 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, 98450128 + ... + 98457123.

It is an arithmetic number, because the mean of its divisors is an integer number (47848462236).

Almost surely, 2^688781563998 is an apocalyptic number.

688781563998 is an abundant number, since it is smaller than the sum of its proper divisors (842369227554).

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

688781563998 is a wasteful number, since it uses less digits than its factorization.

688781563998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196907320.

The product of its digits is 1254113280, while the sum is 78.

The spelling of 688781563998 in words is "six hundred eighty-eight billion, seven hundred eighty-one million, five hundred sixty-three thousand, nine hundred ninety-eight".