78550505 has 16 divisors (see below), whose sum is σ = 104773824. Its totient is φ = 56047680.

The previous prime is 78550501. The next prime is 78550529. The reversal of 78550505 is 50505587.

It is not a de Polignac number, because 78550505 - 2² = 78550501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78550501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10559 + ... + 16388.

It is an arithmetic number, because the mean of its divisors is an integer number (6548364).

Almost surely, 2^78550505 is an apocalyptic number.

It is an amenable number.

78550505 is a deficient number, since it is larger than the sum of its proper divisors (26223319).

78550505 is a wasteful number, since it uses less digits than its factorization.

78550505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27016.

The product of its (nonzero) digits is 35000, while the sum is 35.

The square root of 78550505 is about 8862.8722770894. The cubic root of 78550505 is about 428.2686921013.

The spelling of 78550505 in words is "seventy-eight million, five hundred fifty thousand, five hundred five".