22778019 has 12 divisors (see below), whose sum is σ = 35892792. Its totient is φ = 13804800.

The previous prime is 22778009. The next prime is 22778023. The reversal of 22778019 is 91087722.

It is not a de Polignac number, because 22778019 - 2⁷ = 22777891 is a prime.

It is a super-2 number, since 2×22778019² = 1037676299128722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22778009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114942 + ... + 115139.

It is an arithmetic number, because the mean of its divisors is an integer number (2991066).

Almost surely, 2^22778019 is an apocalyptic number.

22778019 is a deficient number, since it is larger than the sum of its proper divisors (13114773).

22778019 is a wasteful number, since it uses less digits than its factorization.

22778019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230098 (or 230095 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 22778019 is about 4772.6322925614. The cubic root of 22778019 is about 283.4688337658.

It can be divided in two parts, 2277 and 8019, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 22778019 in words is "twenty-two million, seven hundred seventy-eight thousand, nineteen".