687671145 has 36 divisors (see below), whose sum is σ = 1386574020. Its totient is φ = 314362944.

The previous prime is 687671143. The next prime is 687671167. The reversal of 687671145 is 541176786.

It can be written as a sum of positive squares in 2 ways, for example, as 484352064 + 203319081 = 22008^2 + 14259^2 .

It is not a de Polignac number, because 687671145 - 2¹ = 687671143 is a prime.

It is a super-2 number, since 2×687671145² = 945783207331222050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 687671145.

It is not an unprimeable number, because it can be changed into a prime (687671141) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 153730 + ... + 158139.

It is an arithmetic number, because the mean of its divisors is an integer number (38515945).

Almost surely, 2^687671145 is an apocalyptic number.

It is an amenable number.

687671145 is an abundant number, since it is smaller than the sum of its proper divisors (698902875).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687671145 is a wasteful number, since it uses less digits than its factorization.

687671145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311894 (or 311884 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 687671145 is about 26223.4846082667. The cubic root of 687671145 is about 882.6603142965.

The spelling of 687671145 in words is "six hundred eighty-seven million, six hundred seventy-one thousand, one hundred forty-five".