78080805 has 24 divisors (see below), whose sum is σ = 147644640. Its totient is φ = 37857120.

The previous prime is 78080803. The next prime is 78080809. The reversal of 78080805 is 50808087.

It is not a de Polignac number, because 78080805 - 2¹ = 78080803 is a prime.

It is a super-2 number, since 2×78080805² = 12193224218896050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78080805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78080801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78375 + ... + 79364.

It is an arithmetic number, because the mean of its divisors is an integer number (6151860).

Almost surely, 2^78080805 is an apocalyptic number.

It is an amenable number.

78080805 is a deficient number, since it is larger than the sum of its proper divisors (69563835).

78080805 is a wasteful number, since it uses less digits than its factorization.

78080805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157761 (or 157758 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 78080805 is about 8836.3343644296. The cubic root of 78080805 is about 427.4133609179.

The spelling of 78080805 in words is "seventy-eight million, eighty thousand, eight hundred five".