678513985 has 16 divisors (see below), whose sum is σ = 844905600. Its totient is φ = 522708480.

The previous prime is 678513967. The next prime is 678513989. The reversal of 678513985 is 589315876.

It is not a de Polignac number, because 678513985 - 2²³ = 670125377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678513989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6960 + ... + 37489.

It is an arithmetic number, because the mean of its divisors is an integer number (52806600).

Almost surely, 2^678513985 is an apocalyptic number.

It is an amenable number.

678513985 is a deficient number, since it is larger than the sum of its proper divisors (166391615).

678513985 is a wasteful number, since it uses less digits than its factorization.

678513985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44568.

The product of its digits is 1814400, while the sum is 52.

The square root of 678513985 is about 26048.3010002572. The cubic root of 678513985 is about 878.7249030520.

The spelling of 678513985 in words is "six hundred seventy-eight million, five hundred thirteen thousand, nine hundred eighty-five".