687187377 has 6 divisors (see below), whose sum is σ = 992604002. Its totient is φ = 458124912.

The previous prime is 687187373. The next prime is 687187427. The reversal of 687187377 is 773781786.

It can be written as a sum of positive squares in only one way, i.e., 574848576 + 112338801 = 23976^2 + 10599^2 .

It is not a de Polignac number, because 687187377 - 2² = 687187373 is a prime.

It is a super-2 number, since 2×687187377² = 944452982216280258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687187373) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38177068 + ... + 38177085.

Almost surely, 2^687187377 is an apocalyptic number.

It is an amenable number.

687187377 is a deficient number, since it is larger than the sum of its proper divisors (305416625).

687187377 is a wasteful number, since it uses less digits than its factorization.

687187377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76354159 (or 76354156 counting only the distinct ones).

The product of its digits is 2765952, while the sum is 54.

The square root of 687187377 is about 26214.2590396906. The cubic root of 687187377 is about 882.4532855990.

The spelling of 687187377 in words is "six hundred eighty-seven million, one hundred eighty-seven thousand, three hundred seventy-seven".