28575578 has 8 divisors (see below), whose sum is σ = 42991572. Its totient is φ = 14245056.

The previous prime is 28575571. The next prime is 28575587. The reversal of 28575578 is 87557582.

It can be written as a sum of positive squares in 2 ways, for example, as 28440889 + 134689 = 5333^2 + 367^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28575571) 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, 20525 + ... + 21872.

Almost surely, 2^28575578 is an apocalyptic number.

28575578 is a deficient number, since it is larger than the sum of its proper divisors (14415994).

28575578 is a wasteful number, since it uses less digits than its factorization.

28575578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42736.

The product of its digits is 784000, while the sum is 47.

The square root of 28575578 is about 5345.6129676586. The cubic root of 28575578 is about 305.7255074719.

The spelling of 28575578 in words is "twenty-eight million, five hundred seventy-five thousand, five hundred seventy-eight".