28677729025 has 27 divisors (see below), whose sum is σ = 39099732483. Its totient is φ = 20849756400.

The previous prime is 28677728971. The next prime is 28677729043. The reversal of 28677729025 is 52092777682.

It is a happy number.

The square root of 28677729025 is 169345.

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

It can be written as a sum of positive squares in only one way, i.e., 10323982449 + 18353746576 = 101607^2 + 135476^2 .

It is not a de Polignac number, because 28677729025 - 2¹³ = 28677720833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 9312436 + ... + 9315514.

Almost surely, 2^28677729025 is an apocalyptic number.

28677729025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28677729025 is the 169345-th square number.

28677729025 is the 84673-rd centered octagonal number.

It is an amenable number.

28677729025 is a deficient number, since it is larger than the sum of its proper divisors (10422003458).

28677729025 is an frugal number, since it uses more digits than its factorization.

28677729025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190 (or 3095 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 28677729025 in words is "twenty-eight billion, six hundred seventy-seven million, seven hundred twenty-nine thousand, twenty-five".