28146557 has 4 divisors (see below), whose sum is σ = 28207296. Its totient is φ = 28085820.

The previous prime is 28146539. The next prime is 28146571. The reversal of 28146557 is 75564182.

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 28146557 - 2⁶ = 28146493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28146557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28146257) 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, 29669 + ... + 30602.

It is an arithmetic number, because the mean of its divisors is an integer number (7051824).

Almost surely, 2^28146557 is an apocalyptic number.

It is an amenable number.

28146557 is a deficient number, since it is larger than the sum of its proper divisors (60739).

28146557 is an equidigital number, since it uses as much as digits as its factorization.

28146557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60738.

The product of its digits is 67200, while the sum is 38.

The square root of 28146557 is about 5305.3328830527. The cubic root of 28146557 is about 304.1877771383.

The spelling of 28146557 in words is "twenty-eight million, one hundred forty-six thousand, five hundred fifty-seven".