28457271 has 32 divisors (see below), whose sum is σ = 43704320. Its totient is φ = 18289152.

The previous prime is 28457267. The next prime is 28457333. The reversal of 28457271 is 17275482.

28457271 is a `hidden beast` number, since 2 + 84 + 572 + 7 + 1 = 666.

It is not a de Polignac number, because 28457271 - 2² = 28457267 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28457071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147351 + ... + 147543.

It is an arithmetic number, because the mean of its divisors is an integer number (1365760).

Almost surely, 2^28457271 is an apocalyptic number.

28457271 is a deficient number, since it is larger than the sum of its proper divisors (15247049).

28457271 is a wasteful number, since it uses less digits than its factorization.

28457271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 366 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 28457271 is about 5334.5356873865. The cubic root of 28457271 is about 305.3030080176.

The spelling of 28457271 in words is "twenty-eight million, four hundred fifty-seven thousand, two hundred seventy-one".