28147601 has 4 divisors (see below), whose sum is σ = 28158900. Its totient is φ = 28136304.

The previous prime is 28147591. The next prime is 28147633. The reversal of 28147601 is 10674182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2907025 + 25240576 = 1705^2 + 5024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28147601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28147001) 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, 86 + ... + 7503.

It is an arithmetic number, because the mean of its divisors is an integer number (7039725).

Almost surely, 2^28147601 is an apocalyptic number.

It is an amenable number.

28147601 is a deficient number, since it is larger than the sum of its proper divisors (11299).

28147601 is an equidigital number, since it uses as much as digits as its factorization.

28147601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11298.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 28147601 is about 5305.4312737043. The cubic root of 28147601 is about 304.1915380259.

The spelling of 28147601 in words is "twenty-eight million, one hundred forty-seven thousand, six hundred one".