687751092 has 72 divisors (see below), whose sum is σ = 1990497600. Its totient is φ = 196138368.

The previous prime is 687751091. The next prime is 687751123. The reversal of 687751092 is 290157786.

687751092 is a `hidden beast` number, since 68 + 77 + 510 + 9 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687751091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153784 + ... + 158192.

It is an arithmetic number, because the mean of its divisors is an integer number (27645800).

Almost surely, 2^687751092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687751092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (995248800).

687751092 is an abundant number, since it is smaller than the sum of its proper divisors (1302746508).

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

687751092 is a wasteful number, since it uses less digits than its factorization.

687751092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045 (or 5040 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 687751092 is about 26225.0089037163. The cubic root of 687751092 is about 882.6945182957.

The spelling of 687751092 in words is "six hundred eighty-seven million, seven hundred fifty-one thousand, ninety-two".