77646228 has 24 divisors (see below), whose sum is σ = 197645280. Its totient is φ = 23529120.

The previous prime is 77646221. The next prime is 77646277. The reversal of 77646228 is 82264677.

77646228 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

77646228 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 77646228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77646221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293983 + ... + 294246.

It is an arithmetic number, because the mean of its divisors is an integer number (8235220).

Almost surely, 2^77646228 is an apocalyptic number.

It is an amenable number.

77646228 is an abundant number, since it is smaller than the sum of its proper divisors (119999052).

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

77646228 is a wasteful number, since it uses less digits than its factorization.

77646228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588247 (or 588245 counting only the distinct ones).

The product of its digits is 225792, while the sum is 42.

The square root of 77646228 is about 8811.7097092449. The cubic root of 77646228 is about 426.6189288496.

The spelling of 77646228 in words is "seventy-seven million, six hundred forty-six thousand, two hundred twenty-eight".