78217106 has 16 divisors (see below), whose sum is σ = 128737728. Its totient is φ = 35346000.

The previous prime is 78217099. The next prime is 78217109. The reversal of 78217106 is 60171287.

It is a super-2 number, since 2×78217106² = 12235831342030472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78217109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6470 + ... + 14081.

It is an arithmetic number, because the mean of its divisors is an integer number (8046108).

Almost surely, 2^78217106 is an apocalyptic number.

78217106 is a deficient number, since it is larger than the sum of its proper divisors (50520622).

78217106 is a wasteful number, since it uses less digits than its factorization.

78217106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20737.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 78217106 is about 8844.0435322312. The cubic root of 78217106 is about 427.6619196720.

The spelling of 78217106 in words is "seventy-eight million, two hundred seventeen thousand, one hundred six".