687030871 has 4 divisors (see below), whose sum is σ = 687172672. Its totient is φ = 686889072.

The previous prime is 687030863. The next prime is 687030889. The reversal of 687030871 is 178030786.

687030871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 687030871 - 2³ = 687030863 is a prime.

It is a super-2 number, since 2×687030871² = 944022835414037282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687030821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63366 + ... + 73411.

It is an arithmetic number, because the mean of its divisors is an integer number (171793168).

Almost surely, 2^687030871 is an apocalyptic number.

687030871 is a deficient number, since it is larger than the sum of its proper divisors (141801).

687030871 is a wasteful number, since it uses less digits than its factorization.

687030871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141800.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 687030871 is about 26211.2737386034. The cubic root of 687030871 is about 882.3862879966.

The spelling of 687030871 in words is "six hundred eighty-seven million, thirty thousand, eight hundred seventy-one".