28731945025 has 81 divisors (see below), whose sum is σ = 43181322249. Its totient is φ = 18908621760.

The previous prime is 28731945019. The next prime is 28731945091. The reversal of 28731945025 is 52054913782.

The square root of 28731945025 is 169505.

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

It can be written as a sum of positive squares in 4 ways, for example, as 394936129 + 28337008896 = 19873^2 + 168336^2 .

It is not a de Polignac number, because 28731945025 - 2¹³ = 28731936833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 172047492 + ... + 172047658.

Almost surely, 2^28731945025 is an apocalyptic number.

28731945025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28731945025 is the 169505-th square number.

28731945025 is the 84753-rd centered octagonal number.

It is an amenable number.

28731945025 is a deficient number, since it is larger than the sum of its proper divisors (14449377224).

28731945025 is an equidigital number, since it uses as much as digits as its factorization.

28731945025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 28731945025 in words is "twenty-eight billion, seven hundred thirty-one million, nine hundred forty-five thousand, twenty-five".