687240738 has 54 divisors (see below), whose sum is σ = 1539571761. Its totient is φ = 221554224.

The previous prime is 687240727. The next prime is 687240751. The reversal of 687240738 is 837042786.

It is a happy number.

687240738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 554461209 + 132779529 = 23547^2 + 11523^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18537.

It is a junction number, because it is equal to n+sod(n) for n = 687240693 and 687240702.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4115131 + ... + 4115297.

Almost surely, 2^687240738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687240738

687240738 is an abundant number, since it is smaller than the sum of its proper divisors (852331023).

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

687240738 is a wasteful number, since it uses less digits than its factorization.

687240738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 687240738 is about 26215.2768057101. The cubic root of 687240738 is about 882.4761262257.

The spelling of 687240738 in words is "six hundred eighty-seven million, two hundred forty thousand, seven hundred thirty-eight".