78679220 has 12 divisors (see below), whose sum is σ = 165226404. Its totient is φ = 31471680.

The previous prime is 78679219. The next prime is 78679229. The reversal of 78679220 is 2297687.

It can be written as a sum of positive squares in 2 ways, for example, as 13586596 + 65092624 = 3686^2 + 8068^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78679229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966961 + ... + 1967000.

It is an arithmetic number, because the mean of its divisors is an integer number (13768867).

Almost surely, 2^78679220 is an apocalyptic number.

It is an amenable number.

78679220 is an abundant number, since it is smaller than the sum of its proper divisors (86547184).

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

78679220 is a wasteful number, since it uses less digits than its factorization.

78679220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933970 (or 3933968 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 78679220 is about 8870.1307769390. The cubic root of 78679220 is about 428.5024886993.

The spelling of 78679220 in words is "seventy-eight million, six hundred seventy-nine thousand, two hundred twenty".