78921206 has 16 divisors (see below), whose sum is σ = 145701024. Its totient is φ = 31221504.

The previous prime is 78921197. The next prime is 78921217. The reversal of 78921206 is 60212987.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216635 + ... + 216998.

It is an arithmetic number, because the mean of its divisors is an integer number (9106314).

Almost surely, 2^78921206 is an apocalyptic number.

78921206 is a deficient number, since it is larger than the sum of its proper divisors (66779818).

78921206 is a wasteful number, since it uses less digits than its factorization.

78921206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433655.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 78921206 is about 8883.7608027231. The cubic root of 78921206 is about 428.9413401935.

The spelling of 78921206 in words is "seventy-eight million, nine hundred twenty-one thousand, two hundred six".