28106432402500 has 45 divisors (see below), whose sum is σ = 61463726054731. Its totient is φ = 11242466930000.

The previous prime is 28106432402473. The next prime is 28106432402501. The reversal of 28106432402500 is 520423460182.

The square root of 28106432402500 is 5301550.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2203544300356 + 25902888102144 = 1484434^2 + 5089488^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28106432402500.

It is not an unprimeable number, because it can be changed into a prime (28106432402501) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 265024485 + ... + 265130515.

Almost surely, 2^{28106432402500} is an apocalyptic number.

28106432402500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

28106432402500 is the 5301550-th square number.

It is an amenable number.

28106432402500 is an abundant number, since it is smaller than the sum of its proper divisors (33357293652231).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28106432402500 is an frugal number, since it uses more digits than its factorization.

28106432402500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212086 (or 106038 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

Adding to 28106432402500 its reverse (520423460182), we get a palindrome (28626855862682).

The spelling of 28106432402500 in words is "twenty-eight trillion, one hundred six billion, four hundred thirty-two million, four hundred two thousand, five hundred".