78210166 has 32 divisors (see below), whose sum is σ = 131010048. Its totient is φ = 34826880.

The previous prime is 78210133. The next prime is 78210169. The reversal of 78210166 is 66101287.

It is a super-2 number, since 2×78210166² = 12233660131495112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78210169) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 80061 + ... + 81031.

It is an arithmetic number, because the mean of its divisors is an integer number (4094064).

Almost surely, 2^78210166 is an apocalyptic number.

78210166 is a deficient number, since it is larger than the sum of its proper divisors (52799882).

78210166 is a wasteful number, since it uses less digits than its factorization.

78210166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 78210166 is about 8843.6511690591. The cubic root of 78210166 is about 427.6492708554.

The spelling of 78210166 in words is "seventy-eight million, two hundred ten thousand, one hundred sixty-six".