678612990 has 32 divisors (see below), whose sum is σ = 1776733056.
Its totient is φ = 164512160.
The previous prime is 678612989. The next prime is 678613027. The reversal of 678612990 is 99216876.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1027872 + ... + 1028531.
It is an arithmetic number, because the mean of its divisors is an integer number (55522908).
Almost surely, 2678612990 is an apocalyptic number.
678612990 is an abundant number, since it is smaller than the sum of its proper divisors (1098120066).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
678612990 is a wasteful number, since it uses less digits than its factorization.
678612990 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2056424.
The product of its (nonzero) digits is 326592, while the sum is 48.
The square root of 678612990 is about 26050.2013427920.
The cubic root of 678612990 is about 878.7676405292.
The spelling of 678612990 in words is "six hundred seventy-eight million, six hundred twelve thousand, nine hundred ninety".