687564045 has 80 divisors (see below), whose sum is σ = 1457343360. Its totient is φ = 303440256.

The previous prime is 687564019. The next prime is 687564061. The reversal of 687564045 is 540465786.

687564045 is a `hidden beast` number, since 6 + 87 + 564 + 0 + 4 + 5 = 666.

It is not a de Polignac number, because 687564045 - 2¹¹ = 687561997 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 78034 + ... + 86396.

It is an arithmetic number, because the mean of its divisors is an integer number (18216792).

Almost surely, 2^687564045 is an apocalyptic number.

It is an amenable number.

687564045 is an abundant number, since it is smaller than the sum of its proper divisors (769779315).

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

687564045 is a wasteful number, since it uses less digits than its factorization.

687564045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8416 (or 8407 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The square root of 687564045 is about 26221.4424660429. The cubic root of 687564045 is about 882.6144891816.

The spelling of 687564045 in words is "six hundred eighty-seven million, five hundred sixty-four thousand, forty-five".