28766542268025 has 27 divisors (see below), whose sum is σ = 51524217582799. Its totient is φ = 15342112968720.

The previous prime is 28766542268017. The next prime is 28766542268029. The reversal of 28766542268025 is 52086224566782.

It is a happy number.

The square root of 28766542268025 is 5363445.

It is a perfect power (a square), and thus also a powerful number.

28766542268025 is a `hidden beast` number, since 2 + 8 + 7 + 6 + 6 + 542 + 2 + 6 + 80 + 2 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10355955216489 + 18410587051536 = 3218067^2 + 4290756^2 .

It is not a de Polignac number, because 28766542268025 - 2³ = 28766542268017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28766542268029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 80272894 + ... + 80630456.

Almost surely, 2^{28766542268025} is an apocalyptic number.

28766542268025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28766542268025 is the 5363445-th square number.

28766542268025 is the 2681723-rd centered octagonal number.

It is an amenable number.

28766542268025 is a deficient number, since it is larger than the sum of its proper divisors (22757675314774).

28766542268025 is an frugal number, since it uses more digits than its factorization.

28766542268025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715142 (or 357571 counting only the distinct ones).

The product of its (nonzero) digits is 154828800, while the sum is 63.

The spelling of 28766542268025 in words is "twenty-eight trillion, seven hundred sixty-six billion, five hundred forty-two million, two hundred sixty-eight thousand, twenty-five".