77726228 has 12 divisors (see below), whose sum is σ = 136095540. Its totient is φ = 38841792.

The previous prime is 77726221. The next prime is 77726273. The reversal of 77726228 is 82262777.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 60403984 = 4162^2 + 7772^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77726221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5168 + ... + 13496.

It is an arithmetic number, because the mean of its divisors is an integer number (11341295).

Almost surely, 2^77726228 is an apocalyptic number.

It is an amenable number.

77726228 is a deficient number, since it is larger than the sum of its proper divisors (58369312).

77726228 is a wasteful number, since it uses less digits than its factorization.

77726228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10666 (or 10664 counting only the distinct ones).

The product of its digits is 131712, while the sum is 41.

The square root of 77726228 is about 8816.2479547708. The cubic root of 77726228 is about 426.7653957182.

The spelling of 77726228 in words is "seventy-seven million, seven hundred twenty-six thousand, two hundred twenty-eight".