77122225 has 6 divisors (see below), whose sum is σ = 95631590. Its totient is φ = 61697760.

The previous prime is 77122219. The next prime is 77122229. The reversal of 77122225 is 52222177.

It can be written as a sum of positive squares in 3 ways, for example, as 1014049 + 76108176 = 1007^2 + 8724^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77122225 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77122193 and 77122202.

It is not an unprimeable number, because it can be changed into a prime (77122229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1542420 + ... + 1542469.

Almost surely, 2^77122225 is an apocalyptic number.

It is an amenable number.

77122225 is a deficient number, since it is larger than the sum of its proper divisors (18509365).

77122225 is a wasteful number, since it uses less digits than its factorization.

77122225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084899 (or 3084894 counting only the distinct ones).

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

The square root of 77122225 is about 8781.9260415925. The cubic root of 77122225 is about 425.6570689703.

The spelling of 77122225 in words is "seventy-seven million, one hundred twenty-two thousand, two hundred twenty-five".