77972225 has 6 divisors (see below), whose sum is σ = 96685590. Its totient is φ = 62377760.

The previous prime is 77972203. The next prime is 77972227. The reversal of 77972225 is 52227977.

It can be written as a sum of positive squares in 3 ways, for example, as 14737921 + 63234304 = 3839^2 + 7952^2 .

It is not a de Polignac number, because 77972225 - 2¹⁸ = 77710081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77972227) 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, 1559420 + ... + 1559469.

It is an arithmetic number, because the mean of its divisors is an integer number (16114265).

Almost surely, 2^77972225 is an apocalyptic number.

It is an amenable number.

77972225 is a deficient number, since it is larger than the sum of its proper divisors (18713365).

77972225 is a wasteful number, since it uses less digits than its factorization.

77972225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3118899 (or 3118894 counting only the distinct ones).

The product of its digits is 123480, while the sum is 41.

The square root of 77972225 is about 8830.1882765884. The cubic root of 77972225 is about 427.2151471511.

The spelling of 77972225 in words is "seventy-seven million, nine hundred seventy-two thousand, two hundred twenty-five".