28775015425 has 12 divisors (see below), whose sum is σ = 38425713340. Its totient is φ = 21249241920.

The previous prime is 28775015411. The next prime is 28775015429. The reversal of 28775015425 is 52451057782.

It is a happy number.

It is a Cunningham number, because it is equal to 169632²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1 + 28775015424 = 1^2 + 169632^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28775015425 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28775015429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44268930 + ... + 44269579.

Almost surely, 2^28775015425 is an apocalyptic number.

28775015425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28775015425 is a deficient number, since it is larger than the sum of its proper divisors (9650697915).

28775015425 is a wasteful number, since it uses less digits than its factorization.

28775015425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88538532 (or 88538527 counting only the distinct ones).

The product of its (nonzero) digits is 784000, while the sum is 46.

The spelling of 28775015425 in words is "twenty-eight billion, seven hundred seventy-five million, fifteen thousand, four hundred twenty-five".