77774228 has 12 divisors (see below), whose sum is σ = 155548512. Its totient is φ = 33331800.

The previous prime is 77774227. The next prime is 77774231. The reversal of 77774228 is 82247777.

77774228 is an admirable number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77774227) by changing a digit.

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, 1388798 + ... + 1388853.

It is an arithmetic number, because the mean of its divisors is an integer number (12962376).

Almost surely, 2^77774228 is an apocalyptic number.

It is an amenable number.

77774228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77774228 is a wasteful number, since it uses less digits than its factorization.

77774228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777662 (or 2777660 counting only the distinct ones).

The product of its digits is 307328, while the sum is 44.

The square root of 77774228 is about 8818.9697811026. The cubic root of 77774228 is about 426.8532276045.

The spelling of 77774228 in words is "seventy-seven million, seven hundred seventy-four thousand, two hundred twenty-eight".