78891211 has 16 divisors (see below), whose sum is σ = 95420160. Its totient is φ = 63715680.

The previous prime is 78891209. The next prime is 78891221. The reversal of 78891211 is 11219887.

It is not a de Polignac number, because 78891211 - 2¹ = 78891209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78891221) 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, 24696 + ... + 27706.

It is an arithmetic number, because the mean of its divisors is an integer number (5963760).

Almost surely, 2^78891211 is an apocalyptic number.

78891211 is a deficient number, since it is larger than the sum of its proper divisors (16528949).

78891211 is a wasteful number, since it uses less digits than its factorization.

78891211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234.

The product of its digits is 8064, while the sum is 37.

The square root of 78891211 is about 8882.0724496032. The cubic root of 78891211 is about 428.8869917851.

The spelling of 78891211 in words is "seventy-eight million, eight hundred ninety-one thousand, two hundred eleven".