688747536 has 85 divisors (see below), whose sum is σ = 2001672511. Its totient is φ = 229582512.

The previous prime is 688747483. The next prime is 688747547. The reversal of 688747536 is 635747886.

The square root of 688747536 is 26244.

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

688747536 is a `hidden beast` number, since 68 + 8 + 7 + 47 + 536 = 666.

It is an ABA number since it can be written as A⋅B^A, here for A=16, B=3.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

Its product of digits (6773760) is a multiple of the sum of its prime divisors (5).

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 16 ways as a sum of consecutive naturals, for example, 229582511 + 229582512 + 229582513.

Almost surely, 2^688747536 is an apocalyptic number.

688747536 is the 26244-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688747536

688747536 is an abundant number, since it is smaller than the sum of its proper divisors (1312924975).

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

688747536 is an frugal number, since it uses more digits than its factorization.

688747536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56 (or 5 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The cubic root of 688747536 is about 883.1206081164.

The spelling of 688747536 in words is "six hundred eighty-eight million, seven hundred forty-seven thousand, five hundred thirty-six".