77212225 has 12 divisors (see below), whose sum is σ = 98079660. Its totient is φ = 60262400.

The previous prime is 77212193. The next prime is 77212237. The reversal of 77212225 is 52221277.

It can be written as a sum of positive squares in 6 ways, for example, as 28547649 + 48664576 = 5343^2 + 6976^2 .

It is not a de Polignac number, because 77212225 - 2⁵ = 77212193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77212193 and 77212202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36640 + ... + 38689.

It is an arithmetic number, because the mean of its divisors is an integer number (8173305).

Almost surely, 2^77212225 is an apocalyptic number.

It is an amenable number.

77212225 is a deficient number, since it is larger than the sum of its proper divisors (20867435).

77212225 is a wasteful number, since it uses less digits than its factorization.

77212225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75380 (or 75375 counting only the distinct ones).

The product of its digits is 3920, while the sum is 28.

The square root of 77212225 is about 8787.0487081841. The cubic root of 77212225 is about 425.8225821925.

The spelling of 77212225 in words is "seventy-seven million, two hundred twelve thousand, two hundred twenty-five".