22478779 has 2 divisors, whose sum is σ = 22478780. Its totient is φ = 22478778.

The previous prime is 22478761. The next prime is 22478791. The reversal of 22478779 is 97787422.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22478779 - 2⁵ = 22478747 is a prime.

It is not a weakly prime, because it can be changed into another prime (22478749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11239389 + 11239390.

It is an arithmetic number, because the mean of its divisors is an integer number (11239390).

Almost surely, 2^22478779 is an apocalyptic number.

22478779 is a deficient number, since it is larger than the sum of its proper divisors (1).

22478779 is an equidigital number, since it uses as much as digits as its factorization.

22478779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 46.

The square root of 22478779 is about 4741.1790727624. The cubic root of 22478779 is about 282.2220264108. Note that the first 3 decimals are identical.

It can be divided in two parts, 2247 and 8779, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 22478779 in words is "twenty-two million, four hundred seventy-eight thousand, seven hundred seventy-nine".