28071357 has 4 divisors (see below), whose sum is σ = 37428480. Its totient is φ = 18714236.

The previous prime is 28071349. The next prime is 28071359. The reversal of 28071357 is 75317082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28071357 - 2³ = 28071349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071359) 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, 4678557 + ... + 4678562.

It is an arithmetic number, because the mean of its divisors is an integer number (9357120).

Almost surely, 2^28071357 is an apocalyptic number.

It is an amenable number.

28071357 is a deficient number, since it is larger than the sum of its proper divisors (9357123).

28071357 is an equidigital number, since it uses as much as digits as its factorization.

28071357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9357122.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 28071357 is about 5298.2409344989. The cubic root of 28071357 is about 303.9166329861.

The spelling of 28071357 in words is "twenty-eight million, seventy-one thousand, three hundred fifty-seven".