687639548 has 6 divisors (see below), whose sum is σ = 1203369216. Its totient is φ = 343819772.

The previous prime is 687639541. The next prime is 687639553. The reversal of 687639548 is 845936786.

It is a junction number, because it is equal to n+sod(n) for n = 687639493 and 687639502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687639541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85954940 + ... + 85954947.

It is an arithmetic number, because the mean of its divisors is an integer number (200561536).

Almost surely, 2^687639548 is an apocalyptic number.

It is an amenable number.

687639548 is a deficient number, since it is larger than the sum of its proper divisors (515729668).

687639548 is a wasteful number, since it uses less digits than its factorization.

687639548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171909891 (or 171909889 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 56.

The square root of 687639548 is about 26222.8821451800. The cubic root of 687639548 is about 882.6467953128.

The spelling of 687639548 in words is "six hundred eighty-seven million, six hundred thirty-nine thousand, five hundred forty-eight".