687989271 has 8 divisors (see below), whose sum is σ = 957202560. Its totient is φ = 438717752.

The previous prime is 687989261. The next prime is 687989273. The reversal of 687989271 is 172989786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687989271 - 2²² = 683794967 is a prime.

It is a super-2 number, since 2×687989271² = 946658474022222882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687989273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4985361 + ... + 4985498.

It is an arithmetic number, because the mean of its divisors is an integer number (119650320).

Almost surely, 2^687989271 is an apocalyptic number.

687989271 is a deficient number, since it is larger than the sum of its proper divisors (269213289).

687989271 is a wasteful number, since it uses less digits than its factorization.

687989271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9970885.

The product of its digits is 3048192, while the sum is 57.

The square root of 687989271 is about 26229.5495767655. The cubic root of 687989271 is about 882.7964035247.

The spelling of 687989271 in words is "six hundred eighty-seven million, nine hundred eighty-nine thousand, two hundred seventy-one".