725777 has 4 divisors (see below), whose sum is σ = 781620. Its totient is φ = 669936.

The previous prime is 725749. The next prime is 725789. The reversal of 725777 is 777527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 777527 = 281 ⋅2767.

It can be written as a sum of positive squares in 2 ways, for example, as 201601 + 524176 = 449^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 725777 - 2¹⁶ = 660241 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27902 + ... + 27927.

It is an arithmetic number, because the mean of its divisors is an integer number (195405).

2⁷²⁵⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

725777 is a deficient number, since it is larger than the sum of its proper divisors (55843).

725777 is a wasteful number, since it uses less digits than its factorization.

725777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55842.

The product of its digits is 24010, while the sum is 35.

The square root of 725777 is about 851.9254662234. The cubic root of 725777 is about 89.8671703102.

The spelling of 725777 in words is "seven hundred twenty-five thousand, seven hundred seventy-seven".