28147506 has 32 divisors (see below), whose sum is σ = 57361920. Its totient is φ = 9206784.

The previous prime is 28147481. The next prime is 28147507. The reversal of 28147506 is 60574182.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28147507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126111 + ... + 126333.

It is an arithmetic number, because the mean of its divisors is an integer number (1792560).

Almost surely, 2^28147506 is an apocalyptic number.

28147506 is an abundant number, since it is smaller than the sum of its proper divisors (29214414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28147506 is a wasteful number, since it uses less digits than its factorization.

28147506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 28147506 is about 5305.4223206075. The cubic root of 28147506 is about 304.1911958034.

The spelling of 28147506 in words is "twenty-eight million, one hundred forty-seven thousand, five hundred six".