78056566 has 32 divisors (see below), whose sum is σ = 137456640. Its totient is φ = 32550336.

The previous prime is 78056557. The next prime is 78056597. The reversal of 78056566 is 66565087.

78056566 = 53² + 54² + ... + 616².

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 205765 + ... + 206143.

It is an arithmetic number, because the mean of its divisors is an integer number (4295520).

Almost surely, 2^78056566 is an apocalyptic number.

78056566 is a deficient number, since it is larger than the sum of its proper divisors (59400074).

78056566 is a wasteful number, since it uses less digits than its factorization.

78056566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 78056566 is about 8834.9627050713. The cubic root of 78056566 is about 427.3691283451.

The spelling of 78056566 in words is "seventy-eight million, fifty-six thousand, five hundred sixty-six".