687223836 has 36 divisors (see below), whose sum is σ = 1870777272. Its totient is φ = 211453344.

The previous prime is 687223819. The next prime is 687223961. The reversal of 687223836 is 638322786.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 687223791 and 687223800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 733746 + ... + 734681.

Almost surely, 2^687223836 is an apocalyptic number.

It is an amenable number.

687223836 is an abundant number, since it is smaller than the sum of its proper divisors (1183553436).

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

687223836 is a wasteful number, since it uses less digits than its factorization.

687223836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468450 (or 1468445 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 687223836 is about 26214.9544344445. The cubic root of 687223836 is about 882.4688916265.

The spelling of 687223836 in words is "six hundred eighty-seven million, two hundred twenty-three thousand, eight hundred thirty-six".