28201272 has 32 divisors (see below), whose sum is σ = 76913280. Its totient is φ = 8545760.

The previous prime is 28201267. The next prime is 28201273. The reversal of 28201272 is 27210282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53148 + ... + 53675.

It is an arithmetic number, because the mean of its divisors is an integer number (2403540).

Almost surely, 2^28201272 is an apocalyptic number.

28201272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28201272 is an abundant number, since it is smaller than the sum of its proper divisors (48712008).

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

28201272 is a wasteful number, since it uses less digits than its factorization.

28201272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106843 (or 106839 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 28201272 is about 5310.4869833189. The cubic root of 28201272 is about 304.3847563657.

The spelling of 28201272 in words is "twenty-eight million, two hundred one thousand, two hundred seventy-two".