687057471 has 12 divisors (see below), whose sum is σ = 1029172872. Its totient is φ = 458038152.

The previous prime is 687057451. The next prime is 687057487. The reversal of 687057471 is 174750786.

687057471 is a `hidden beast` number, since 6 + 8 + 7 + 0 + 574 + 71 = 666.

It is not a de Polignac number, because 687057471 - 2⁵ = 687057439 is a prime.

It is a super-3 number, since 3×687057471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687057451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1413456 + ... + 1413941.

It is an arithmetic number, because the mean of its divisors is an integer number (85764406).

Almost surely, 2^687057471 is an apocalyptic number.

687057471 is a deficient number, since it is larger than the sum of its proper divisors (342115401).

687057471 is an equidigital number, since it uses as much as digits as its factorization.

687057471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827412 (or 2827400 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 687057471 is about 26211.7811489414. The cubic root of 687057471 is about 882.3976757296.

It can be divided in two parts, 68705 and 7471, that added together give a square (76176 = 276²).

The spelling of 687057471 in words is "six hundred eighty-seven million, fifty-seven thousand, four hundred seventy-one".