77235228 has 144 divisors (see below), whose sum is σ = 242376960. Its totient is φ = 20831904.

The previous prime is 77235227. The next prime is 77235239. The reversal of 77235228 is 82253277.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 77235192 and 77235201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77235227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 272775 + ... + 273057.

Almost surely, 2^77235228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77235228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121188480).

77235228 is an abundant number, since it is smaller than the sum of its proper divisors (165141732).

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

77235228 is a wasteful number, since it uses less digits than its factorization.

77235228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 314 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 77235228 is about 8788.3575257269. The cubic root of 77235228 is about 425.8648648936.

The spelling of 77235228 in words is "seventy-seven million, two hundred thirty-five thousand, two hundred twenty-eight".