77725449 has 12 divisors (see below), whose sum is σ = 112346676. Its totient is φ = 51781632.

The previous prime is 77725399. The next prime is 77725457. The reversal of 77725449 is 94452777.

It can be written as a sum of positive squares in 2 ways, for example, as 75951225 + 1774224 = 8715^2 + 1332^2 .

It is not a de Polignac number, because 77725449 - 2⁷ = 77725321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77725489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23209 + ... + 26345.

It is an arithmetic number, because the mean of its divisors is an integer number (9362223).

Almost surely, 2^77725449 is an apocalyptic number.

It is an amenable number.

77725449 is a deficient number, since it is larger than the sum of its proper divisors (34621227).

77725449 is a wasteful number, since it uses less digits than its factorization.

77725449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896 (or 5893 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 77725449 is about 8816.2037748682. The cubic root of 77725449 is about 426.7639699818.

The spelling of 77725449 in words is "seventy-seven million, seven hundred twenty-five thousand, four hundred forty-nine".