28146447 has 24 divisors (see below), whose sum is σ = 48187776. Its totient is φ = 16082712.

The previous prime is 28146439. The next prime is 28146473. The reversal of 28146447 is 74464182.

28146447 is a `hidden beast` number, since 2 + 8 + 1 + 4 + 644 + 7 = 666.

It is not a de Polignac number, because 28146447 - 2³ = 28146439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28146487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6573 + ... + 9974.

It is an arithmetic number, because the mean of its divisors is an integer number (2007824).

Almost surely, 2^28146447 is an apocalyptic number.

28146447 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28146447 is a deficient number, since it is larger than the sum of its proper divisors (20041329).

28146447 is an equidigital number, since it uses as much as digits as its factorization.

28146447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16569 (or 16557 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28146447 is about 5305.3225161153. The cubic root of 28146447 is about 304.1873808707.

It can be divided in two parts, 2814 and 6447, that added together give a cube (9261 = 21³).

The spelling of 28146447 in words is "twenty-eight million, one hundred forty-six thousand, four hundred forty-seven".