28148457 has 4 divisors (see below), whose sum is σ = 37531280. Its totient is φ = 18765636.

The previous prime is 28148437. The next prime is 28148489. The reversal of 28148457 is 75484182.

It is a happy number.

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 not a de Polignac number, because 28148457 - 2⁸ = 28148201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28148437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4691407 + ... + 4691412.

It is an arithmetic number, because the mean of its divisors is an integer number (9382820).

Almost surely, 2^28148457 is an apocalyptic number.

It is an amenable number.

28148457 is a deficient number, since it is larger than the sum of its proper divisors (9382823).

28148457 is an equidigital number, since it uses as much as digits as its factorization.

28148457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9382822.

The product of its digits is 71680, while the sum is 39.

The square root of 28148457 is about 5305.5119451378. The cubic root of 28148457 is about 304.1946215961.

The spelling of 28148457 in words is "twenty-eight million, one hundred forty-eight thousand, four hundred fifty-seven".