28618456525 has 12 divisors (see below), whose sum is σ = 36068640244. Its totient is φ = 22519440000.

The previous prime is 28618456519. The next prime is 28618456549. The reversal of 28618456525 is 52565481682.

It can be written as a sum of positive squares in 6 ways, for example, as 13620290436 + 14998166089 = 116706^2 + 122467^2 .

It is not a de Polignac number, because 28618456525 - 2¹³ = 28618448333 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 9381576 + ... + 9384625.

Almost surely, 2^28618456525 is an apocalyptic number.

28618456525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28618456525 is a deficient number, since it is larger than the sum of its proper divisors (7450183719).

28618456525 is a wasteful number, since it uses less digits than its factorization.

28618456525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18766272 (or 18766267 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 52.

The spelling of 28618456525 in words is "twenty-eight billion, six hundred eighteen million, four hundred fifty-six thousand, five hundred twenty-five".