78666380 has 24 divisors (see below), whose sum is σ = 177907632. Its totient is φ = 29045952.

The previous prime is 78666373. The next prime is 78666389. The reversal of 78666380 is 8366687.

It is not an unprimeable number, because it can be changed into a prime (78666389) 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 7 ways as a sum of consecutive naturals, for example, 151022 + ... + 151541.

It is an arithmetic number, because the mean of its divisors is an integer number (7412818).

Almost surely, 2^78666380 is an apocalyptic number.

It is an amenable number.

78666380 is an abundant number, since it is smaller than the sum of its proper divisors (99241252).

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

78666380 is a wasteful number, since it uses less digits than its factorization.

78666380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302585 (or 302583 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 78666380 is about 8869.4069700291. The cubic root of 78666380 is about 428.4791777104.

The spelling of 78666380 in words is "seventy-eight million, six hundred sixty-six thousand, three hundred eighty".