28201069 has 4 divisors (see below), whose sum is σ = 30370396. Its totient is φ = 26031744.

The previous prime is 28201051. The next prime is 28201087. The reversal of 28201069 is 96010282.

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: 96010282 = 2 ⋅48005141.

It is an interprime number because it is at equal distance from previous prime (28201051) and next prime (28201087).

It can be written as a sum of positive squares in 2 ways, for example, as 14915044 + 13286025 = 3862^2 + 3645^2 .

It is a cyclic number.

It is not a de Polignac number, because 28201069 - 2⁷ = 28200941 is a prime.

It is a super-2 number, since 2×28201069² = 1590600585485522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201009) 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, 1084644 + ... + 1084669.

It is an arithmetic number, because the mean of its divisors is an integer number (7592599).

Almost surely, 2^28201069 is an apocalyptic number.

It is an amenable number.

28201069 is a deficient number, since it is larger than the sum of its proper divisors (2169327).

28201069 is a wasteful number, since it uses less digits than its factorization.

28201069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169326.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28201069 is about 5310.4678701598. The cubic root of 28201069 is about 304.3840260174.

The spelling of 28201069 in words is "twenty-eight million, two hundred one thousand, sixty-nine".