78545566 has 16 divisors (see below), whose sum is σ = 129003120. Its totient is φ = 35570880.

The previous prime is 78545557. The next prime is 78545567. The reversal of 78545566 is 66554587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78545567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351 + ... + 12538.

It is an arithmetic number, because the mean of its divisors is an integer number (8062695).

Almost surely, 2^78545566 is an apocalyptic number.

78545566 is a deficient number, since it is larger than the sum of its proper divisors (50457554).

78545566 is a wasteful number, since it uses less digits than its factorization.

78545566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13179.

The product of its digits is 1008000, while the sum is 46.

The square root of 78545566 is about 8862.5936384334. The cubic root of 78545566 is about 428.2597158662.

The spelling of 78545566 in words is "seventy-eight million, five hundred forty-five thousand, five hundred sixty-six".