78778205 has 16 divisors (see below), whose sum is σ = 104376384. Its totient is φ = 56599680.

The previous prime is 78778129. The next prime is 78778207. The reversal of 78778205 is 50287787.

It is not a de Polignac number, because 78778205 - 2¹² = 78774109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78778207) 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, 4064 + ... + 13193.

It is an arithmetic number, because the mean of its divisors is an integer number (6523524).

Almost surely, 2^78778205 is an apocalyptic number.

It is an amenable number.

78778205 is a deficient number, since it is larger than the sum of its proper divisors (25598179).

78778205 is a wasteful number, since it uses less digits than its factorization.

78778205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17356.

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 78778205 is about 8875.7087040979. The cubic root of 78778205 is about 428.6821106458.

The spelling of 78778205 in words is "seventy-eight million, seven hundred seventy-eight thousand, two hundred five".