6687945 has 48 divisors (see below), whose sum is σ = 12916800. Its totient is φ = 3173760.

The previous prime is 6687931. The next prime is 6687973. The reversal of 6687945 is 5497866.

It is not a de Polignac number, because 6687945 - 2⁶ = 6687881 is a prime.

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 6687945.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29091 + ... + 29319.

It is an arithmetic number, because the mean of its divisors is an integer number (269100).

Almost surely, 2^6687945 is an apocalyptic number.

It is an amenable number.

6687945 is a deficient number, since it is larger than the sum of its proper divisors (6228855).

6687945 is a wasteful number, since it uses less digits than its factorization.

6687945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 307 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 6687945 is about 2586.1061463134. The cubic root of 6687945 is about 188.4072299009.

The spelling of 6687945 in words is "six million, six hundred eighty-seven thousand, nine hundred forty-five".