688495019536 has 45 divisors (see below), whose sum is σ = 1340518199949. Its totient is φ = 342563105088.

The previous prime is 688495019441. The next prime is 688495019557. The reversal of 688495019536 is 635910594886.

The square root of 688495019536 is 829756.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 673548490000 + 14946529536 = 820700^2 + 122256^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 939283426 + ... + 939284158.

Almost surely, 2^688495019536 is an apocalyptic number.

688495019536 is the 829756-th square number.

It is an amenable number.

688495019536 is a deficient number, since it is larger than the sum of its proper divisors (652023180413).

688495019536 is an frugal number, since it uses more digits than its factorization.

688495019536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040 (or 1018 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 64.

Multiplying 688495019536 by its sum of digits (64), we get a square (44063681250304 = 6638048²).

The spelling of 688495019536 in words is "six hundred eighty-eight billion, four hundred ninety-five million, nineteen thousand, five hundred thirty-six".