28356001 has 4 divisors (see below), whose sum is σ = 28372500. Its totient is φ = 28339504.

The previous prime is 28355981. The next prime is 28356019. The reversal of 28356001 is 10065382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10065382 = 2 ⋅5032691.

It can be written as a sum of positive squares in 2 ways, for example, as 23270976 + 5085025 = 4824^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 28356001 - 2¹¹ = 28353953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28356071) 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, 5326 + ... + 9223.

It is an arithmetic number, because the mean of its divisors is an integer number (7093125).

Almost surely, 2^28356001 is an apocalyptic number.

It is an amenable number.

28356001 is a deficient number, since it is larger than the sum of its proper divisors (16499).

28356001 is a wasteful number, since it uses less digits than its factorization.

28356001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16498.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 28356001 is about 5325.0353050473. The cubic root of 28356001 is about 304.9404201458.

It can be divided in two parts, 2835 and 6001, that added together give a square (8836 = 94²).

The spelling of 28356001 in words is "twenty-eight million, three hundred fifty-six thousand, one".