78511966 has 16 divisors (see below), whose sum is σ = 129922128. Its totient is φ = 35352000.

The previous prime is 78511957. The next prime is 78511991. The reversal of 78511966 is 66911587.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 35760 + ... + 37891.

It is an arithmetic number, because the mean of its divisors is an integer number (8120133).

Almost surely, 2^78511966 is an apocalyptic number.

78511966 is a deficient number, since it is larger than the sum of its proper divisors (51410162).

78511966 is a wasteful number, since it uses less digits than its factorization.

78511966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73707.

The product of its digits is 90720, while the sum is 43.

The square root of 78511966 is about 8860.6978280494. The cubic root of 78511966 is about 428.1986405799.

The spelling of 78511966 in words is "seventy-eight million, five hundred eleven thousand, nine hundred sixty-six".