78227228 has 12 divisors (see below), whose sum is σ = 136999800. Its totient is φ = 39084432.

The previous prime is 78227207. The next prime is 78227231. The reversal of 78227228 is 82272287.

It is a super-2 number, since 2×78227228² = 12238998401127968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78227191 and 78227200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578 + ... + 12521.

It is an arithmetic number, because the mean of its divisors is an integer number (11416650).

Almost surely, 2^78227228 is an apocalyptic number.

It is an amenable number.

78227228 is a deficient number, since it is larger than the sum of its proper divisors (58772572).

78227228 is a wasteful number, since it uses less digits than its factorization.

78227228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14596 (or 14594 counting only the distinct ones).

The product of its digits is 50176, while the sum is 38.

The square root of 78227228 is about 8844.6157632765. The cubic root of 78227228 is about 427.6803666481.

The spelling of 78227228 in words is "seventy-eight million, two hundred twenty-seven thousand, two hundred twenty-eight".