78981166 has 16 divisors (see below), whose sum is σ = 129765888. Its totient is φ = 35755000.

The previous prime is 78981151. The next prime is 78981169. The reversal of 78981166 is 66118987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78981169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1630 + ... + 12673.

It is an arithmetic number, because the mean of its divisors is an integer number (8110368).

Almost surely, 2^78981166 is an apocalyptic number.

78981166 is a deficient number, since it is larger than the sum of its proper divisors (50784722).

78981166 is a wasteful number, since it uses less digits than its factorization.

78981166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14567.

The product of its digits is 145152, while the sum is 46.

The square root of 78981166 is about 8887.1348588845. The cubic root of 78981166 is about 429.0499413897.

The spelling of 78981166 in words is "seventy-eight million, nine hundred eighty-one thousand, one hundred sixty-six".