687752145 has 24 divisors (see below), whose sum is σ = 1196010816. Its totient is φ = 365599008.

The previous prime is 687752137. The next prime is 687752207. The reversal of 687752145 is 541257786.

687752145 is a `hidden beast` number, since 6 + 87 + 7 + 521 + 45 = 666.

It is not a de Polignac number, because 687752145 - 2³ = 687752137 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 687752145.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11077 + ... + 38706.

It is an arithmetic number, because the mean of its divisors is an integer number (49833784).

Almost surely, 2^687752145 is an apocalyptic number.

It is an amenable number.

687752145 is a deficient number, since it is larger than the sum of its proper divisors (508258671).

687752145 is a wasteful number, since it uses less digits than its factorization.

687752145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50101 (or 50098 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 687752145 is about 26225.0289799649. The cubic root of 687752145 is about 882.6949687866.

The spelling of 687752145 in words is "six hundred eighty-seven million, seven hundred fifty-two thousand, one hundred forty-five".