28545427 has 4 divisors (see below), whose sum is σ = 28563840. Its totient is φ = 28527016.

The previous prime is 28545401. The next prime is 28545437. The reversal of 28545427 is 72454582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72454582 = 2 ⋅36227291.

It is a cyclic number.

It is not a de Polignac number, because 28545427 - 2⁷ = 28545299 is a prime.

It is a super-2 number, since 2×28545427² = 1629682805224658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28545437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643 + ... + 10060.

It is an arithmetic number, because the mean of its divisors is an integer number (7140960).

Almost surely, 2^28545427 is an apocalyptic number.

28545427 is a deficient number, since it is larger than the sum of its proper divisors (18413).

28545427 is a wasteful number, since it uses less digits than its factorization.

28545427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18412.

The product of its digits is 89600, while the sum is 37.

The square root of 28545427 is about 5342.7920603370. The cubic root of 28545427 is about 305.6179427335.

It can be divided in two parts, 2854 and 5427, that added together give a square (8281 = 91²).

The spelling of 28545427 in words is "twenty-eight million, five hundred forty-five thousand, four hundred twenty-seven".