28127149 has 4 divisors (see below), whose sum is σ = 28137760. Its totient is φ = 28116540.

The previous prime is 28127111. The next prime is 28127159. The reversal of 28127149 is 94172182.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28127149 - 2²³ = 19738541 is a prime.

It is a super-2 number, since 2×28127149² = 1582273021736402, 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 (28127159) 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, 2464 + ... + 7894.

It is an arithmetic number, because the mean of its divisors is an integer number (7034440).

Almost surely, 2^28127149 is an apocalyptic number.

It is an amenable number.

28127149 is a deficient number, since it is larger than the sum of its proper divisors (10611).

28127149 is an equidigital number, since it uses as much as digits as its factorization.

28127149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610.

The product of its digits is 8064, while the sum is 34.

The square root of 28127149 is about 5303.5034646920. The cubic root of 28127149 is about 304.1178451530.

The spelling of 28127149 in words is "twenty-eight million, one hundred twenty-seven thousand, one hundred forty-nine".