28391741 has 4 divisors (see below), whose sum is σ = 32447712. Its totient is φ = 24335772.

The previous prime is 28391711. The next prime is 28391747. The reversal of 28391741 is 14719382.

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 28391741 - 2⁶ = 28391677 is a prime.

It is a super-2 number, since 2×28391741² = 1612181914022162, which 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 (28391747) 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, 2027975 + ... + 2027988.

It is an arithmetic number, because the mean of its divisors is an integer number (8111928).

Almost surely, 2^28391741 is an apocalyptic number.

It is an amenable number.

28391741 is a deficient number, since it is larger than the sum of its proper divisors (4055971).

28391741 is an equidigital number, since it uses as much as digits as its factorization.

28391741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055970.

The product of its digits is 12096, while the sum is 35.

The square root of 28391741 is about 5328.3900945783. The cubic root of 28391741 is about 305.0684823380.

The spelling of 28391741 in words is "twenty-eight million, three hundred ninety-one thousand, seven hundred forty-one".