77663225 has 24 divisors (see below), whose sum is σ = 104477688. Its totient is φ = 57036800.

The previous prime is 77663221. The next prime is 77663233. The reversal of 77663225 is 52236677.

It can be written as a sum of positive squares in 12 ways, for example, as 22250089 + 55413136 = 4717^2 + 7444^2 .

It is not a de Polignac number, because 77663225 - 2² = 77663221 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77663221) 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 23 ways as a sum of consecutive naturals, for example, 15197 + ... + 19653.

It is an arithmetic number, because the mean of its divisors is an integer number (4353237).

Almost surely, 2^77663225 is an apocalyptic number.

It is an amenable number.

77663225 is a deficient number, since it is larger than the sum of its proper divisors (26814463).

77663225 is a wasteful number, since it uses less digits than its factorization.

77663225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4525 (or 4520 counting only the distinct ones).

The product of its digits is 105840, while the sum is 38.

The square root of 77663225 is about 8812.6741117552. The cubic root of 77663225 is about 426.6500559804.

The spelling of 77663225 in words is "seventy-seven million, six hundred sixty-three thousand, two hundred twenty-five".