687570947 has 16 divisors (see below), whose sum is σ = 848240640. Its totient is φ = 544280352.

The previous prime is 687570941. The next prime is 687570953. The reversal of 687570947 is 749075786.

It is an interprime number because it is at equal distance from previous prime (687570941) and next prime (687570953).

It is not a de Polignac number, because 687570947 - 2⁴ = 687570931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687570941) 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, 68963 + ... + 78300.

It is an arithmetic number, because the mean of its divisors is an integer number (53015040).

Almost surely, 2^687570947 is an apocalyptic number.

687570947 is a deficient number, since it is larger than the sum of its proper divisors (160669693).

687570947 is a wasteful number, since it uses less digits than its factorization.

687570947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147322.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The square root of 687570947 is about 26221.5740755585. The cubic root of 687570947 is about 882.6174424992.

The spelling of 687570947 in words is "six hundred eighty-seven million, five hundred seventy thousand, nine hundred forty-seven".