678137513 has 4 divisors (see below), whose sum is σ = 678614160. Its totient is φ = 677660868.

The previous prime is 678137503. The next prime is 678137557. The reversal of 678137513 is 315731876.

678137513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678137513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678137503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236183 + ... + 239036.

It is an arithmetic number, because the mean of its divisors is an integer number (169653540).

Almost surely, 2^678137513 is an apocalyptic number.

It is an amenable number.

678137513 is a deficient number, since it is larger than the sum of its proper divisors (476647).

678137513 is a wasteful number, since it uses less digits than its factorization.

678137513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476646.

The product of its digits is 105840, while the sum is 41.

The square root of 678137513 is about 26041.0735761796. The cubic root of 678137513 is about 878.5623534549.

The spelling of 678137513 in words is "six hundred seventy-eight million, one hundred thirty-seven thousand, five hundred thirteen".