28255300778025 has 36 divisors (see below), whose sum is σ = 52808747666688. Its totient is φ = 14414298365280.

The previous prime is 28255300778021. The next prime is 28255300778027. The reversal of 28255300778025 is 52087700355282.

28255300778025 is a `hidden beast` number, since 2 + 8 + 2 + 5 + 530 + 0 + 7 + 7 + 80 + 25 = 666.

It is not a de Polignac number, because 28255300778025 - 2² = 28255300778021 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28255300778021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2729975577 + ... + 2729985926.

It is an arithmetic number, because the mean of its divisors is an integer number (1466909657408).

Almost surely, 2^{28255300778025} is an apocalyptic number.

28255300778025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28255300778025 is a deficient number, since it is larger than the sum of its proper divisors (24553446888663).

28255300778025 is a wasteful number, since it uses less digits than its factorization.

28255300778025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459961542 (or 5459961534 counting only the distinct ones).

The product of its (nonzero) digits is 9408000, while the sum is 54.

The spelling of 28255300778025 in words is "twenty-eight trillion, two hundred fifty-five billion, three hundred million, seven hundred seventy-eight thousand, twenty-five".