78561776 has 20 divisors (see below), whose sum is σ = 152557944. Its totient is φ = 39192000.

The previous prime is 78561761. The next prime is 78561803. The reversal of 78561776 is 67716587.

It is a self number, because there is not a number n which added to its sum of digits gives 78561776.

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 3 ways as a sum of consecutive naturals, for example, 2051 + ... + 12701.

Almost surely, 2^78561776 is an apocalyptic number.

It is an amenable number.

78561776 is a deficient number, since it is larger than the sum of its proper divisors (73996168).

78561776 is a wasteful number, since it uses less digits than its factorization.

78561776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120 (or 11114 counting only the distinct ones).

The product of its digits is 493920, while the sum is 47.

The square root of 78561776 is about 8863.5081090954. The cubic root of 78561776 is about 428.2891748280.

The spelling of 78561776 in words is "seventy-eight million, five hundred sixty-one thousand, seven hundred seventy-six".