28571431 has 8 divisors (see below), whose sum is σ = 32706720. Its totient is φ = 24449568.

The previous prime is 28571423. The next prime is 28571449. The reversal of 28571431 is 13417582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28571431 - 2³ = 28571423 is a prime.

It is a super-2 number, since 2×28571431² = 1632653338775522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28571393 and 28571402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28571401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1725 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (4088340).

Almost surely, 2^28571431 is an apocalyptic number.

28571431 is a deficient number, since it is larger than the sum of its proper divisors (4135289).

28571431 is an equidigital number, since it uses as much as digits as its factorization.

28571431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6713.

The product of its digits is 6720, while the sum is 31.

The square root of 28571431 is about 5345.2250654205. The cubic root of 28571431 is about 305.7107173947.

The spelling of 28571431 in words is "twenty-eight million, five hundred seventy-one thousand, four hundred thirty-one".