687130257 has 16 divisors (see below), whose sum is σ = 1001624832. Its totient is φ = 415541520.

The previous prime is 687130253. The next prime is 687130273. The reversal of 687130257 is 752031786.

It is not a de Polignac number, because 687130257 - 2² = 687130253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687130253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6883 + ... + 37704.

It is an arithmetic number, because the mean of its divisors is an integer number (62601552).

Almost surely, 2^687130257 is an apocalyptic number.

It is an amenable number.

687130257 is a deficient number, since it is larger than the sum of its proper divisors (314494575).

687130257 is a wasteful number, since it uses less digits than its factorization.

687130257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45068.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 687130257 is about 26213.1695336524. The cubic root of 687130257 is about 882.4288346608.

It can be divided in two parts, 6871 and 30257, that added together give a triangular number (37128 = T₂₇₂).

The spelling of 687130257 in words is "six hundred eighty-seven million, one hundred thirty thousand, two hundred fifty-seven".