28240578 has 12 divisors (see below), whose sum is σ = 61187958. Its totient is φ = 9413520.

The previous prime is 28240571. The next prime is 28240591. The reversal of 28240578 is 87504282.

It is a happy number.

28240578 is a `hidden beast` number, since 2 + 82 + 4 + 0 + 578 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21095649 + 7144929 = 4593^2 + 2673^2 .

It is not an unprimeable number, because it can be changed into a prime (28240571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 784443 + ... + 784478.

Almost surely, 2^28240578 is an apocalyptic number.

28240578 is an abundant number, since it is smaller than the sum of its proper divisors (32947380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28240578 is a wasteful number, since it uses less digits than its factorization.

28240578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568929 (or 1568926 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28240578 is about 5314.1864852487. The cubic root of 28240578 is about 304.5261045186.

The spelling of 28240578 in words is "twenty-eight million, two hundred forty thousand, five hundred seventy-eight".