28240471 has 4 divisors (see below), whose sum is σ = 32274832. Its totient is φ = 24206112.

The previous prime is 28240469. The next prime is 28240489. The reversal of 28240471 is 17404282.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28240471 - 2¹ = 28240469 is a prime.

It is a super-3 number, since 3×28240471³ (a number of 23 digits) contains 333 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 (28240571) 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, 2017170 + ... + 2017183.

It is an arithmetic number, because the mean of its divisors is an integer number (8068708).

Almost surely, 2^28240471 is an apocalyptic number.

28240471 is a deficient number, since it is larger than the sum of its proper divisors (4034361).

28240471 is an equidigital number, since it uses as much as digits as its factorization.

28240471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034360.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 28240471 is about 5314.1764178469. The cubic root of 28240471 is about 304.5257199144.

The spelling of 28240471 in words is "twenty-eight million, two hundred forty thousand, four hundred seventy-one".