678520395 has 168 divisors, whose sum is σ = 1480271760. Its totient is φ = 297198720.

The previous prime is 678520391. The next prime is 678520397. The reversal of 678520395 is 593025876.

It is a happy number.

It is not a de Polignac number, because 678520395 - 2² = 678520391 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 678520395.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678520391) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 5179480 + ... + 5179610.

Almost surely, 2^678520395 is an apocalyptic number.

678520395 is an abundant number, since it is smaller than the sum of its proper divisors (801751365).

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

678520395 is a wasteful number, since it uses less digits than its factorization.

678520395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 678520395 is about 26048.4240406210. The cubic root of 678520395 is about 878.7276701819.

The spelling of 678520395 in words is "six hundred seventy-eight million, five hundred twenty thousand, three hundred ninety-five".