687116428 has 6 divisors (see below), whose sum is σ = 1202453756. Its totient is φ = 343558212.

The previous prime is 687116407. The next prime is 687116431. The reversal of 687116428 is 824611786.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85889550 + ... + 85889557.

Almost surely, 2^687116428 is an apocalyptic number.

It is an amenable number.

687116428 is a deficient number, since it is larger than the sum of its proper divisors (515337328).

687116428 is a wasteful number, since it uses less digits than its factorization.

687116428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171779111 (or 171779109 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 687116428 is about 26212.9057527013. The cubic root of 687116428 is about 882.4229147787.

The spelling of 687116428 in words is "six hundred eighty-seven million, one hundred sixteen thousand, four hundred twenty-eight".