28166435526436 has 27 divisors (see below), whose sum is σ = 50660170121169. Its totient is φ = 13702399196688.

The previous prime is 28166435526401. The next prime is 28166435526479. The reversal of 28166435526436 is 63462553466182.

The square root of 28166435526436 is 5307206.

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., 25203713308900 + 2962722217536 = 5020330^2 + 1721256^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 392697385 + ... + 392769103.

Almost surely, 2^{28166435526436} is an apocalyptic number.

28166435526436 is the 5307206-th square number.

It is an amenable number.

28166435526436 is a deficient number, since it is larger than the sum of its proper divisors (22493734594733).

28166435526436 is an frugal number, since it uses more digits than its factorization.

28166435526436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143516 (or 71758 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 61.

The spelling of 28166435526436 in words is "twenty-eight trillion, one hundred sixty-six billion, four hundred thirty-five million, five hundred twenty-six thousand, four hundred thirty-six".