728122025 has 12 divisors (see below), whose sum is σ = 908935500. Its totient is φ = 578585280.

The previous prime is 728121991. The next prime is 728122033. The reversal of 728122025 is 520221827.

It can be written as a sum of positive squares in 6 ways, for example, as 279190681 + 448931344 = 16709^2 + 21188^2 .

It is not a de Polignac number, because 728122025 - 2¹⁰ = 728121001 is a prime.

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, 94010 + ... + 101459.

It is an arithmetic number, because the mean of its divisors is an integer number (75744625).

Almost surely, 2^728122025 is an apocalyptic number.

It is an amenable number.

728122025 is a deficient number, since it is larger than the sum of its proper divisors (180813475).

728122025 is a wasteful number, since it uses less digits than its factorization.

728122025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195628 (or 195623 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 728122025 is about 26983.7363054118. The cubic root of 728122025 is about 899.6385482713.

The spelling of 728122025 in words is "seven hundred twenty-eight million, one hundred twenty-two thousand, twenty-five".