28891541 has 4 divisors (see below), whose sum is σ = 33018912. Its totient is φ = 24764172.

The previous prime is 28891537. The next prime is 28891559. The reversal of 28891541 is 14519882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28891541 - 2² = 28891537 is a prime.

It is a super-2 number, since 2×28891541² = 1669442282709362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28891495 and 28891504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28891531) 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, 2063675 + ... + 2063688.

It is an arithmetic number, because the mean of its divisors is an integer number (8254728).

Almost surely, 2^28891541 is an apocalyptic number.

It is an amenable number.

28891541 is a deficient number, since it is larger than the sum of its proper divisors (4127371).

28891541 is an equidigital number, since it uses as much as digits as its factorization.

28891541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4127370.

The product of its digits is 23040, while the sum is 38.

The square root of 28891541 is about 5375.0852086269. The cubic root of 28891541 is about 306.8481921240.

The spelling of 28891541 in words is "twenty-eight million, eight hundred ninety-one thousand, five hundred forty-one".