78382660 has 12 divisors (see below), whose sum is σ = 164603628. Its totient is φ = 31353056.

The previous prime is 78382639. The next prime is 78382669. The reversal of 78382660 is 6628387.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15116544 + 63266116 = 3888^2 + 7954^2 .

It is a super-2 number, since 2×78382660² = 12287682777351200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78382669) 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, 1959547 + ... + 1959586.

It is an arithmetic number, because the mean of its divisors is an integer number (13716969).

Almost surely, 2^78382660 is an apocalyptic number.

It is an amenable number.

78382660 is an abundant number, since it is smaller than the sum of its proper divisors (86220968).

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

78382660 is a wasteful number, since it uses less digits than its factorization.

78382660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919142 (or 3919140 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 78382660 is about 8853.3982176337. The cubic root of 78382660 is about 427.9634361870.

The spelling of 78382660 in words is "seventy-eight million, three hundred eighty-two thousand, six hundred sixty".