28542803381 has 4 divisors (see below), whose sum is σ = 28543323852. Its totient is φ = 28542282912.

The previous prime is 28542803347. The next prime is 28542803423. The reversal of 28542803381 is 18330824582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11340120100 + 17202683281 = 106490^2 + 131159^2 .

It is a cyclic number.

It is not a de Polignac number, because 28542803381 - 2¹⁰ = 28542802357 is a prime.

It is a super-2 number, since 2×28542803381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28542803881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166790 + ... + 291383.

It is an arithmetic number, because the mean of its divisors is an integer number (7135830963).

Almost surely, 2^28542803381 is an apocalyptic number.

It is an amenable number.

28542803381 is a deficient number, since it is larger than the sum of its proper divisors (520471).

28542803381 is an equidigital number, since it uses as much as digits as its factorization.

28542803381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520470.

The product of its (nonzero) digits is 368640, while the sum is 44.

The spelling of 28542803381 in words is "twenty-eight billion, five hundred forty-two million, eight hundred three thousand, three hundred eighty-one".