28641238541 has 4 divisors (see below), whose sum is σ = 28963050300. Its totient is φ = 28319426784.

The previous prime is 28641238511. The next prime is 28641238559. The reversal of 28641238541 is 14583214682.

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 2455202500 + 26186036041 = 49550^2 + 161821^2 .

It is a cyclic number.

It is not a de Polignac number, because 28641238541 - 2²² = 28637044237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28641238492 and 28641238501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28641238511) 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, 160905746 + ... + 160905923.

It is an arithmetic number, because the mean of its divisors is an integer number (7240762575).

Almost surely, 2^28641238541 is an apocalyptic number.

It is an amenable number.

28641238541 is a deficient number, since it is larger than the sum of its proper divisors (321811759).

28641238541 is an equidigital number, since it uses as much as digits as its factorization.

28641238541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321811758.

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

The spelling of 28641238541 in words is "twenty-eight billion, six hundred forty-one million, two hundred thirty-eight thousand, five hundred forty-one".