78922211 has 4 divisors (see below), whose sum is σ = 83564712. Its totient is φ = 74279712.

The previous prime is 78922199. The next prime is 78922231. The reversal of 78922211 is 11222987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11222987 = 1523 ⋅7369.

It is a cyclic number.

It is not a de Polignac number, because 78922211 - 2¹⁸ = 78660067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78922231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321225 + ... + 2321258.

It is an arithmetic number, because the mean of its divisors is an integer number (20891178).

Almost surely, 2^78922211 is an apocalyptic number.

78922211 is a deficient number, since it is larger than the sum of its proper divisors (4642501).

78922211 is a wasteful number, since it uses less digits than its factorization.

78922211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4642500.

The product of its digits is 4032, while the sum is 32.

The square root of 78922211 is about 8883.8173664253. The cubic root of 78922211 is about 428.9431609303.

The spelling of 78922211 in words is "seventy-eight million, nine hundred twenty-two thousand, two hundred eleven".